I Have Yashimoto Deseas Wich Is Hyper And Hypo Thyroidism.

I have yashimoto deseas Wich is hyper and hypo thyroidism. Also I was diagnosed with Graves disease. I've been using crystal meth on and off for about a month maybe 2. I smoke it also I might add. Towards the end of my high I usually get heart arythmias and thought the whole time I use I have tachycardia. I also seem to get very anxious, to the point of having a panic attack or where I can give myself a heart attack. I don't know if this is just the come down of the meth or what. Is there any way to prevent this from happening. And I've only used meth 5 or 6 times and I've only had the anxiety attack twice. My thyroid at the moment is hypo and I'm going to have it removed soon. How can meth affect me and how will my high be after being removed? Also is there any way to prevent heart arythmias tachycardia and anxiety attacks during or before the use of my illicit substance? And what are some signs of a meth overdose and what are my risks as a person with these conditions and the use of this substance? I wouldn't consider my abuse heavy I've probably have used a total of 2/3 grams. I should also add that all my symptoms where meth induced. Tachycardia, arythmias, anxiety. None had to do with my thyroid. Thanks I apreciate the response