Per doctor's instructions I took pink 25 mcg levothyroxine for 2 weeks, felt great. Took 2 of same for 3 weeks, felt wonderful. Changed script to one 50 mcg for one week and feel like death warmed-over. Non stop dizzy, headache, etc. Doctor's response was to up dosage to 62.5 mcg. What can I do to be able to function? Feel worse than before...