Confusion in symptoms. Gastric issues?

I am unable to distinguish between symptoms of GERD,anxiety and covid (like heavy breathing, foreign body sensation in throat, headache,low appetite, nausea etc.). I am living with a covid patient since 20 days but my rt-pcr is negative and no symptoms, but sometimes I have acidity and anxiety issues which makes me feel breathless and fast heartbeat, bitter taste in mouth and I get panick. Last year I took medication for GERD and anxiety for 5-6 months and got relieved. Took these tests as suggested by doctor- vitamin b12, thyroid, endoscopy also done and reports were normal. Doctor asked me to take MultiVitamins like zincovit, sorbex, limcee as precaution. Can I take them even if I have gastric issues? Monitoring SpO2 levels- it's 99. I am overthinking alot. Plz help. Ty