Occipital neuralgia; anaphylaxis; feeling like passing out on and off for the next 2-3 hours; he felt lightheaded; little short of breath; fatigue; he had a lot of posterior lymph pain in the back of his head, for 2 weeks on and off; heaviness at the back of his head left sid; chest tightness; he developed a sensation like he was going to lose control of his mind; This is a spontaneous report from a contactable Other Health Professional, the patient.  A 27-year-old male patient received the second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, Lot number EL1283), via an unspecified route of administration on 08Jan2021 at 13:30 (at the age of 27-years-old) as a single dose in the left arm for COVID-19 vaccination. Medical history included asthma exacerbation, GERD, childhood anemia, a retinal tear in the right eye all from unspecified dates and unknown if ongoing. The patient also reported medical history three episodes (June 2019, August 2019 and October2019) of anaphylaxis due to "Exercise Induced Anaphylaxis."  Historical vaccinations included the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE, lot number EH9899) on 21Dec2020 at 13:30 after which he experienced  pain at the vaccination site which lasted twenty-four hours.  The patient's past product use included adrenaline (EPIPEN), an unspecified corticosteroid and an unspecified antihistamine for past allergic reactions. The vaccine was administered in a hospital. Prior to the vaccination, the patient had not been diagnosed with COVID-19.  Concomitant medications included ciclosportin (RESTASIS), azelastine (AZELASTINE), mometasone furoate (FLONASE), cetirizine hydrochloride (ZYRTEC) and omeprazole (PROTONIX) all for unknown indications from unknown dates and unknown if ongoing. Within four weeks prior to the vaccination the patient had received unspecified "allergy shots"  He received "two shots" (one in each deltoid) on 15Dec2021 and "two shots" (one in each deltoid) on 05Jan2021. The patient reported that fifteen to thirty seconds after the second dose of the COVID-19 vaccination he felt lightheaded and a little short of breath. This lasted about eight minutes and then subsided. Approximately thirty to forty minutes (about 30 minutes after he left the facility) later the symptoms returned. He felt short of breath and he thought he was going to pass out. The symptoms included fatigue, shortness of breath lightheaded and feeling like passing out on and off for the next two to three hours. He stated he has completely recovered. He continued to say that he was feeling fine for three days then he began having bilateral cervical lymph pain greater on the left than right, a lot of posterior lymph pain in the back of his head (for two weeks on and off). These symptoms also resolved on their own. He also experienced ("a couple of days later") a sensation where he thought he was going to lose control of his muscles and lose consciousness. He also developed a sense that the was going to lose control of his mind with heaviness at the back of his head, left side. He went to the Emergency Room (date not provided) and they provided Valium.  He also reports an Emergency Room visit on 13Jan2021 during which he underwent a CT scan of the head which was normal and a neuro consult suggesting occipital neuralgia and he was put on muscle relaxers. He also stated that experienced shortness of breath and chest tightness after his allergy shots on 26Jan2021 and he specified that  he had never before had these reactions to his allergy shots. After that he had yet another possible allergic reaction after eating pizza on 30Jan which included throat swelling as well. He further stated that on 04Feb he had anaphylaxis vs asthma exacerbation. On the following day he developed a heaviness to his left occipital head with that same feeling of wanting to lose control of his muscles. He never had that before. He started Prilosec about one and one half weeks prior to the reporting date. In follow up the Other HCP reporter/patient answered "Yes" to the following questions (DCA) about symptoms experienced: Bilateral wheeze/bronchospasm, upper airway swelling, increased use of accessory respiratory muscles, dry cough, difficulty breathing (without wheeze or stridor, sensation of throat closure, tachycardia, nausea. These were reported without dates and without context with regard to the events reported initially. These were also reported as not requiring treatment and having recovered on unspecified dates.  Lab data included three SARS COV 2 nasal swab tests (14Jan2021, 03Feb2021 and 11Feb2021) all of which were negative. Unspecified treatment was reported for the events anaphylactic reaction and mental impairment. The clinical outcomes of the events Anaphylaxis, loss of consciousness, dizziness, dyspnea, fatigue and lymph node pain were reported as recovered on an unspecified date in 2021. The clinical outcome of mental impairment, heaviness of head, chest tightness and occipital neuralgia were reported as unknown.