I'd get the thorough once-over for thyroid testing by a good endocrinologist and soon? Usually, and from what you are saying you either have Type 2 Diabetes or pre-diabetes.. I do know that dlife.com is a good beginner's site. I'm wading thru it myself as my DH is Type 2... Endocrinologist specialise in thyroid and diabetes issues and they do not mess around-they know what tests to do and what to do about it all.

Type 2 and Pre-D are both usually controlled by diet, meds and exercises, plus a few other coping things. Some folks are actually able to get off meds, and get improved relief from PN as a result of some diabetes programs.
If you can see either a diabetes certified counselor or a certified nutritionist they can do heaps to help you work out programs to get the sugar thing in control. I only know this because my DH developed diabetic PN after I'd gotten my own immune PN... I do believe I got a 'bit' more understanding about the pain etc...and at my urging [A lot!?]...he got treatment. He is really really improving...but he too has what I call FUSSY FEET!
Rule these issues out totally before you go outside the 'norm'. There is a good doc out there waiting for just you! Hugs! - j

PS I do hope that the eye infection gets under control soon! Please let me/us know.