Severe difficulty breathing; difficulty breathing frightened her; This is a spontaneous report from a contactable consumer (patient). A 64 -year-old female patient received her first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, lot number: EL9262), intramuscular (on the upper left shoulder) on 27Jan2021 09:20 (at the age of 64-year-old), single dose for COVID-19 immunization. Medical history included ongoing hypothyroidism diagnosed about 14 years ago, breast cancer from Dec2017 and ongoing diagnosed in Dec2017, ongoing asthma she was diagnosed with asthma when she was 39 years old, surgery from an unknown date, she had surgery to correct a deviated septum and her asthma got better, she has high blood pressure after all the treatment. Concomitant medication included salbutamol (ALBUTEROL). On 27Jan2021 she had the first injection. It was about 14 to 16 hours after the injection that she had severe difficulty breathing. Reported she has asthma. She was a cancer survivor, and she has high blood pressure after all the treatment. The difficulty breathing woke her out of her sleep. She had to call the doctor since she is concerned about her second dose which is scheduled for 17Feb2021. The difficulty breathing frightened her, and it was not an immediate reaction, she had the shot at 9:30 am (clarifies she received the injection at 09:20 am) and between 1 to 2 am in the night, she woke up not able to breathe. She could not use her inhaler since she could not really breathe in. She was obviously able to get some air in since she did not pass out. She contacted her doctor and he will send her a prescription to get an Epipen, so she has it on hand when she gets her second dose. Her doctor does not want her to not get the second dose. States she is concerned about other asthmatics receiving the vaccine and wanted to call and report this. She expected it to happen onsite where she received the injection but it did not. Her doctor asked her if she thought it was an asthma attack and she told her doctor that she has not felt like this in 24 years. Treatment/Outcome: She stepped out into the cold to shrink her airways and then was able to use her inhaler. Reports it was not a 2 hour episode thank god, and within 15 minutes she was able to force an inhaler dose in. Everything is fine. She is a breast cancer survivor and cannot use her right side so she had the injection on her left side in her upper shoulder, she has to wait 5 years to be considered cancer free. Her doctor suggested to use her albuterol inhaler for 4 days in advance of getting the second dose of the vaccine. She would think that would be abusing her albuterol but she will do that since she was instructed to do so by her doctor. She was terrified. She will have an Epipen on hand when she goes to get her second dose.  She understands the symptoms can be worse with the second dose, she is anticipating everything should be fine. The outcome of the event difficulty of breathing was recovered on Jan2021, for the other event was unknown. No additional vaccines administered on same date of the Pfizer Suspect. No AE(s) following prior vaccinations, states she has had everything. No Prior Vaccinations within 4 weeks.