Plavix interaction with levothyroxine?

I recently had a stent procedure to address heart rhythm concerns. I started on Plavix after the procedure per protocols. Felt great first 2 weeks after procedure. At that point I started a painful download trend. Dizzy, headaches, joint aches and pains, blurred vision. Eventually had Thyroid screen. My TSH had crashed into the hyperthyroid range. I had Graves Disease 40 years ago and radioactive iodine therapy. Have been on stable levothyroxine dose for many years. After recent TSH tests I lowered my levothroxine dose and am feeling much better.