About 6 weeks ago I switched from armour to thyroid usp(generic for armour because i was having problems with the fillers in the name brand. Im on 75 grain and a week after the switch I started having heart palps short of breath, muscle aches really bad cramping in my feet. I started feeling hyper the last few days went and did labs but only a t4 (total) and it was a 6.5 normal ranges for that lab are 4-12 so the test actually says Im normal but I feel like **** also neck swelling, tired and neck very itchy. If anyone can explain this it would be greatly appreciated.