Hi I take Mercury Pharma now and feel ok on it. In the past I was given different brands which caused dizziness. My last prescription I was given a brand I know make me dizzy so I gave it back to pharmacist who said they would try and get Mercury Pharma. My husband collected the new prescription it is in a brown bottle with no brand on, Just says 84 Levothyroxine 100mcg tabs. The past 3 days I’ve felt dizzy, could these tablets be a different brand to Mercury Pharma?