headache; temperature also dropped to 96.4/ drop in temperature; feeling freezing cold; This is a Spontaneous Report from a Contactable Nurse (Patient). This Female nurse reported in response to follow-up activity sent via email which included that: A female patient of an unspecified age received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Solution for injection; Lot number: unknown), via an unspecified route of administration as dose 2, single on an unspecified date for covid-19 immunisation. The patient medical history and concomitant medications were not reported. Historical vaccine included first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Solution for injection; Lot number: Unknown), via an unspecified route of administration as dose 1, single on an unspecified date for covid-19 immunisation and caused exhaustion and tiredness. As stated in her initial report patient was a nurse and also the patient. Reporter believed the Pfizer Covid 19 vaccine dose 1 cause the events exhaustion and tiredness. This was also experienced by at least three other people she know (She advised each of them to report the AEs to you). On unspecified date, about 15 hours after patient received the second dose she got a headache that lasted for hours and that nothing she took (Tylenol migraine, ibuprofen, sumatriptan) worked for. Patient's temperature also dropped to 96.4 (she normally run between 97.6 and 98.4) and was freezing cold on unspecified date. In fact, reporter was so cold that even turning up the heat and using four comforters folded in half would not keep me warm. Files password protected but, more importantly, she now asked you guys twice not to contact me about the adverse event that she experienced so please do not contact me again you have all the information that you need she was 100% certain as a healthcare professional that what she experienced was related to the vaccine but she also know aside from the extreme fatigue experienced after the first dose that what she experienced after the second dose was just her body working to build antibodies. Patient actually answered all of these questions in a prior email she was unable to open your attachments done but since she do this for a living working pharmacovigilance and know about adverse event reporting since that's she did already answer all these questions. Reporter don't want to respond to any more emails she asked not to be contacted twice and you totally ignored that and she thought that's very disrespectful. Patient believed the headache, drop in temperature, and feeling freezing cold were all attributable to the vaccine; however, though she was not sure about the headache and believe that the other symptoms were the result of her body doing its job making antibodies. The headache resolved about 8 hours after it started; the low temp and feeling freezing resolved within 25 hours. The patient underwent lab tests and procedures which included body temperature: dropped to 96.4 on unspecified date. Therapeutic measures were taken as a result of headache. At the time of this report, the outcome of event was resolved on unspecified date.  No follow-up attempts are Possible. Information on Lot/batch number cannot be obtained.