I can't say for sure from your given information why you feel the symptoms that you do.
They could be occurring for a number of reasons, still as yet fully compensated
thyroid function, nervousness/
anxiety, caffeine or other drug/medication/
alcohol withdrawal or abstinence, or some other medical condition for which laboratory testing ordered by a physician may reveal something.
However, I can tell you that I am nearly certain your symptoms ARE NOT due to the part of the brain you've been told is shrinking. They are referring to the
cerebellum (that part of your brain where the 2 grapefruits are hanging off the end in back?). It may appear on a scan of some sort to be smaller in size or volume than what would be considered optimal. However, unless you've had a previous scan there's almost no way to know for sure if in fact, it IS SHRINKING since there is no comparator film. So, your cerebellum is the least likely suspect in this case.
If you would care to address further questions DIRECTLY TO MY ATTENTION for consideration you may find me at:
http://doctor.healthcaremagic.com/doctors/dr-dariush-saghafi/68474
Would you be kind enough to leave a little feedback on the response I've given you as well as a star rating if you feel the information has helped you understand your question a bit more?