dehydrated; low blood pressure; didn't sleep through the night because it was scary to her; didn't sleep through the night because it was scary to her; she also had a sore arm after the vaccine; migraine; tachycardia; irregular heart beat; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 59 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 22Feb2022 (Lot number: F16984) at the age of 59 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Migraine" (unspecified if ongoing). The patient took concomitant medications. Vaccination history included: Bnt162b2 (Dose:1, Lot No: EPG955), administration date: 06Mar2021, for Covid-19 Immunization, reaction(s): "Migraine"; Bnt162b2 (Dose:2), administration date: 06Apr2021, for Covid-19 Immunization. The following information was reported: MIGRAINE (non-serious) with onset 22Feb2022, outcome "recovered", described as "migraine"; TACHYCARDIA (non-serious) with onset 22Feb2022, outcome "recovered", described as "tachycardia"; HEART RATE IRREGULAR (non-serious) with onset 22Feb2022, outcome "recovered", described as "irregular heart beat"; DEHYDRATION (non-serious), outcome "unknown", described as "dehydrated"; HYPOTENSION (non-serious), outcome "unknown", described as "low blood pressure"; SLEEP DISORDER (non-serious), FEELING ABNORMAL (non-serious), outcome "unknown" and all described as "didn't sleep through the night because it was scary to her"; PAIN IN EXTREMITY (non-serious), outcome "unknown", described as "she also had a sore arm after the vaccine". The events "dehydrated" and "low blood pressure" were evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of migraine.  Additional Information: She states she got her Pfizer COVID 19 booster shot and a "couple hours later she got a migraine" which she notes that she "fully expected" because she does suffer from them she states. However she also notes that she had "profound tachycardia and irregular heart beat" for "several hours." She saw her HCP the following day and they advised she may be dehydrated & also recorded a "low blood pressure." She wants to know if this could be a possible SE of the product and it makes her "kind of scared" for when she goes "next year." She states "she didnt have a problem with the 1st shots when they came out." 3rd shot "threw me." Although she was hydrated she still had "awful migraine." She also notes that the irregular heart rhythm "scared her. She questions if it could be that with "each progressive vaccine that you can have a reaction or is this something that is unusual and concerning." The She was asks, "At this point would you recommend speaking with HCP regarding when its gets closer to needing another vaccination, because she was thinking that if is something where she was going to had a severe reaction. She can go with J&J since it was not mRNA." Her employer requires full vaccination but she states "this makes both of us nervous that it may be specific to the mRNA but HCP does think it may be dehydration." States that she didn't sleep through the night because it was scary to her. States that the next morning after the booster dose she saw her HCP, she thinks it was around 1000. She states that her heart rate at the HCP office was like 100 or so. Her blood pressure was 90 over something. She states that her doctor told her to hydrate more and take something with some salt to keep the fluids in. She states that she followed the instructions and several hours later her symptoms started dissipating. Later in the call the she mentions that she has small arms and was not surprised when she also had a sore arm after the vaccine. States that she takes a Multivitamin and on occasion she will take something for her Migraines, like Excedrin Migraine. She states that she has recovered completely from her symptoms.