I suffer every three weeks or so from diagnosed chronic sinusitis for about 2 years. Pain round my eyes, head, painful to breath through my nose. I also have an underactive thyroid and still have symptoms ( constipation, brain fog, tiredness etc) all the time and get worse when my sinuses do or other the other way about even though the doctor says they are unrelated, I believe they are. Last March I felt run down with both of the above and blood tests showed I had swung from under to over tsh 0.6 and t4 23.9, 5 weeks later blood tests were tsh 4 and t4 16.9. Frustration with my doctor has stopped me from going back to docs even though I feel lousy 90% of the time. But last month I gave up and went back, this time was given 2 week course of antibiotics for my sinuses, ANOTHER nasal spray and antihistamines. I blubbed like a baby to the doc because I can't handle it anymore. I managed to go a full 4 weeks before another episode. Another prescribed course of antibiotics and nasal sprays and this time my blood test showed my tsh is low at 0.5, don't know my t4 but I haven't spoken to my doc cause she hasn't looked at my results yet. Why do I keep swinging under to over? I take the same 150mc every morning before eating. I can't afford private blood tests or medication and doc won't test t3.