Hi Shire
Firstly ... I have no answers to why you feel so overheated all the time ..
.. so make sure you drink plenty of cold water, to cool you down ... and keep you hydrated... however, this may temporarily make you feel cooler, but it's no long term solution.
You must try and trust Doctors, and ask if there is any financial help you can get to have tests and treatment.
I wish I could help more ...
Please keep in touch and hopefully the more you talk about it, the more we may be able to un-ravel the problem
Take care
Ginger