taking potassium & chlorthalidone (?) for BP and to stave off the family history of future congestive heart failure, along with 400mg am/800mg pm Gabapentin for damaged brachial plexus, a tramadol + amitryptiline to sleep + not be anxious about not sleeping, elevated position due to two ripped rotator cuffs, and methylphenidate 20mg 3x pd so I can pick my head up off the keyboard and work. +magnesium, D2 & B complex. oh and 2 Aleve pd. So, since this fall when I was switched to the potassium & Chlorthalidone from Hydrochlorothiazide my intestines often ache and feel leaden, and occasionally are painful, sometimes just the top row under the ribcage, sometimes the whole section aches. what is causing this?