Yes, your thyroid can go south in 2.5 months. It sounds like you are going hypo.
It sounds like you need blood work on your thyroid again. If it has been 6-8 weeks since your last blood work request it to be checked again.
Hope you get it figured it out.
I've been totally sluggish and lethargic, sudden weight gain, bloating and nausea, and just feeling crappy all the time for about 8 months. I've lost all motivation for everything because I'm sooo tired all the time, it's been awful. Before all this I was very active and athletic. It's like my whole world has been turned upside down.
I'm just waiting to hear from the doc...which should be sometime this week...
Yes there are some incompetent people who read the tests...Unfortunately i can attest to it all too well. Have had to have 3 surgeries due to the misdiagnosis, and mis readings..
If you take thyroid medication it usually takes about 6 weeks to notice a difference, but not everyone is the same.
What symptoms are you having?