I have fluctuating weight, extreme thirst, and insomnia. this has been going on for two years. any ideas what this might be?

See below: Those symptoms can be a part of multiple medical disorders, including sleep apnea. If you snore, have a dry mouth, morning headaches, fatigue, gasping or choking for breath at night, night time reflux, and/or excessive daytime sleepiness, a sleep medicine doctor can help evaluate ; treat you. Otherwise, if you have other symtoms, it may be best to visit your pcp for possible other causes.