drop in blood pressure; swelling of the face and throat; swelling of the face and throat; fast heart beat; no appetite; exacerbation of existing neuropathy; Palpitations; being lightheaded; sweating; burning mouth syndrome; burning mouth syndrome; especially burning mouth syndrome - nerve endings in tongue, lips and cheeks were all on fire; especially burning mouth syndrome - nerve endings in tongue, lips and cheeks were all on fire.; especially burning mouth syndrome - nerve endings in tongue, lips and cheeks were all on fire.; Some of my reactions look like an allergic reaction; difficulty breathing; This is a spontaneous report from a contactable consumer (patient). A 66-years-old (non-pregnant) female patient received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, Solution for injection, Lot Number: EL3302, expiry date not reported) via an unspecified route of administration, administered in left arm on 11Mar2021 14:00 at a single dose for COVID-19 immunisation. Medical history included neuropathy from 2006 and ongoing, since she had chemotherapy in 2006 for breast cancer in 2006 and burning mouth syndrome. The patient had no covid prior vaccination. The patient had no known allergies. The patient had other medications in two weeks which included unspecified dietary supplements. The patient had no other vaccine in four weeks. The patient previously took doxycycline from 2010 to an unknown date for Lyme's diseaseand experienced burning mouth syndrome. On 11Mar2021 at 02:00 PM, patient had palpitations, being lightheaded, sweating, exacerbation of existing neuropathy and especially burning mouth syndrome - nerve endings in tongue, lips and cheeks were all on fire. These symptoms still continue. Patient stated that people were talking about the second dose being worse. Patient stated that some of the reactions in Mar2021 look like an allergic reaction. They (HCP) only have cautioned the patient about difficulty breathing in Mar2021. They were saying there wasn't anything they can do for it. Patient asked how long the side effects will last and how to go about changing the appointment. If they are going to continue, patient was very concerned about following up with the second shot and asked if they can have that second shot be postponed until patient was not experiencing these side effects to the effect that she was. She completed the self-reporting on Monday (15Mar2021), but because her side effects were not going away she wanted to reach out to someone. She has reached out to her practitioner and had an appointment yesterday. Doctors didn't really know because it was all very new. She had the first vaccination shot on 11Mar2021, almost a week ago. In the 15 minutes that she waited afterwards she definitely experienced palpitations and a feeling of lightheadedness. She has an underlying condition of burning and pain called neuropathy. She has had neuropathy since she had chemotherapy in 2006 for breast cancer. This exacerbated that. She had been very concerned about that prior. Everyone said and the CDC recommends even with neuropathy to go ahead with the vaccine. It also triggered another underlying condition. She had a reaction to a course of Doxycycline in 2010 for Lyme's disease that caused burning mouth syndrome. Both of these things were really acute now, the neuropathy and burning mouth syndrome. Monday (15Mar2021) was a particularly bad day because the symptoms of an allergy which were swelling of the face and throat, fast heart beat, and dizziness were with the burning mouth syndrome. She didn't have difficulty breathing. It was the nerve endings of the tongue that go all the way to the back of her throat and gave the sensation of the whole mouth being involved. Monday was difficult. It was 8 hours of an acute episode then it eased off a little that evening. She had no appetite on Monday and barely ate anything. Yesterday was ok and much better although she was being triggered by environmental thing such as food and toothpaste. Things she normally uses were setting it off. She had an acute reaction this morning to a protein shake she has had every day for 14 years. The reaction this morning, 17Mar2021, was a drop in blood pressure and palpitations. It passed. She has been documenting this and made her provider aware of what she was experiencing. She was participating in the V-Safe through the CDC that checks up on her everyday and asks about symptoms. She didn't know if she was supposed to report this to the vaccine adverse event system or not. Obviously, she didn't want to get COVID. She was struggling with the recommendation to get second shot because she was extremely concerned. She wanted to know how long will the side effects will last and if she can postpone getting the second shot until she gets reasonably well. No practitioner can recommend whether to do it or not to do it. She reported this information online to Pfizer on 15Mar2021. She provided the lot number when she reported it online. The patient was not tested for COVID post vaccination. No treatments received from the events had palpitations, being lightheaded, sweating, exacerbation of existing neuropathy and especially burning mouth syndrome - nerve endings in tongue, lips and cheeks were all on fire. The patient recovered with lasting effects from the events had palpitations, being lightheaded, sweating, exacerbation of existing neuropathy and especially burning mouth syndrome - nerve endings in tongue, lips and cheeks were all on fire. The outcome of the other reported events was unknown.