@Rossi bear. I’m sorry to hear about all of your medical problems. Sounds like quite the compilation of illnesses. Not being privy to your detailed medical history makes it impossible to diagnose your problem. There are numerous things that can cause so-called chills, from infectious problems (like pneumonia, for example) to metabolic or endocrine problems (like low thyroid, which you mentioned). The later are not necessarily chills, but rather, a manifestation of cold intolerance.
I know you mentioned a dislike for visiting the doctor, but neither I nor anyone else can give you a diagnosis over the internet, especially considering the complexity of your medical history. However, if I were to venture a guess (and it is only a guess), I would say that you probably need more thyroid medication (given the chronic nature of your problem and your history of hypothyroidism, since cold intolerance is a common manifestation of low thyroid). Every person is different, and many medical conditions and medications affect the amount of hormone replacement that you need. It is typical for people to need frequent monitoring in the beginning of treatment until the right dose is found. (I have a close doctor friend who has severe hypothyroidism, and he is taking huge doses of thyroid hormone, which took him and his endocrinologist months to arrive at).
So, in summary, I strongly suggest a return visit to the doctor who can do a more thorough and formal analysis.