Hi. I'm online and happy to answer your question today.
Well, after three weeks of things not getting better, and actually getting worse, I agree with you -- this is most likely not a simple viral infection.
I would either return to this doctor, or maybe even another one for further workup. At the very least blood work is indicated and maybe even an MRI of your head. It is also interesting to note that you continue to be very thirsty even though you are drinking a lot of water.....
I wish that I could tell you exactly what is going on but, in your case, further examination and studies are the only way to narrow down the choices :(
Does this make sense to you?
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I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)