I don't think any of us knew what a thyroid was when we were first told that the silly little gland had run amok. The doc looked at my neck and asked "how long you had that goiter?". My response: "What's a goiter?". There is much to learn in the world of thyroids.
A colloid cyst is nothing to worry about. Collagen is normal tissue, not only in the thyroid, but the rest of the body too. It is the glue that holds the body together. Sometimes an overactive thyroid makes excess collagen. You can take your fear of cancer off the list. There's no sense in having them stick any more needles in your neck.
I was undiagnosed for a long time too. It happens. It shouldn't, but it does. Thyroid symptoms are often mistaken for mental illness or other diseases and hyper is rare enough that a lot of docs don't know how to recognize it. I found a vast relief in finally finding out I wasn't totally out of my mind.
The lightheadedness isn't coming from the
tapazole. It's coming from the hefty dose of beta blockers that you're taking. As your body gets used to that high a dose, it usually eases off some but some people never quite shake it. It's still better than hyper symptoms. I think once your thyroid's more stable, they'll be able to drop the dose of betas back some but since you've had afib they're being extra cautious about keeping your heart rate under control. Which beta blocker you taking? That can make a difference too.
Of course you don't trust the doctors. Who would after two years of hell while they sat around with their thumbs up their arse? Your best bet is to educate yourself. Learn as much, if not more than the doctors do about it. Now, that ain't going to be hard at all.
You need to start by finding out the particular form of hyperthyroidism you have. Most likely, it'll turn out to be graves cause that's the most common but you want to know for sure what you're dealing with so you may consider all your treatment options. Have at least your TSI antibody level tested to start and we can go from there. You're on the proper treatment right now. 30mg of
tapazole will probably send you hypo after a while but that's ok. It's really important to get your hormone levels down right now to protect your heart. Once they're down, they can start backing off the dose of
tapazole. They should be testing your hormone levels every 4 to 6 weeks until it has stabalized on the meds. Then the testing can be less frequent. It's going to be awhile before you feel 100% again.
In the meantime, I think you will find a lot of comfort in this place. It's so nice to know that you aren't the only one going thru it and it's a place you will find you are never trying to go it alone. Gripe, dump, ask questions, laugh. Learn from other people's successes and failures. You will make it thru this. The rest of us have and I don't think any of us has strangled a doctor yet.
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