I didn’t realize you don’t have a large intestine. The large intestine primarily reabsorbs water and maintains the fluid balance of the body. Certain vitamins are also taken in through the large intestinal wall. Without it your fluids could be imbalanced which could mean your electrolytes are more prone to be off. If they also removed your appendix, that is an issue with your immune system and gi tract, as it is a reservoir of good bacteria that can help replenish the gut with good bacteria in cases where there’s imbalance or a die-off of good gut bacteria.
Your description of the lactic acid issue in the tissues could be linked to the hydration issue you face not having a large intestine. Less fluid gets reabsorbed from your gi tract and dehydration does make it harder for the body to rid itself of waste byproducts such as lactic acid.
Has your doctor mentioned possibly drinking more purified/filtered water?
I believe you when you say it most likely is a lactic acid elimination problem. One way to help your condition is to make your body pH more alkaline. I would suggest reading up on the benefits of alkaline water. It has a pH of about 8-9 and for me personally has been a positive change, and it even tastes better than regular tap water. My wife who isn’t really into as much health stuff as I am, compared the two - regular water filtered through our old PUR filter, and the filtered and then alkalized water, and she could tell the alakaline water tasted better and she could always tell which one it was. One thing they noticed with pets is they drank more water when it was alkaline water. Apparently it hydrates a person/animal more as well.
Upping your body pH could help deal with the lactic acid issue, and drinking more fluids in general to make up for the fact you don’t have a large intestine to recapture water from your gi tract, may help. If you get to the point where you are interested in the alkaline water, pm me and I can tell you which model I use, because I didn’t want one that cost hundreds of dollars and used electricity to produce the alkalinity. The model I found was inexpensive, not powered, and connects easily to your kitchen sink. Doesn’t take a lot of room either.
the problem with mucking with the PH balance is that I get lots of kidney stones, both calcium and uric acid stones- about 50-80 a year- plus lots and lots of ‘sand’ (crushed stone sediment)- (Yep. I have a lot of issues healthwise)- When I try to prevent one type, the other type becomes more prevalent - I do drink a lot of water to help keep kidneys flushed of stones- but I still get them a lot-
There could be some fluid issues, but I would think they would have showed up on tests, had there been a problem bad enough to be causing the muscle pain I’m experiencing-