Regarding CO2:
I'm confused as to why you think you have elevated lactic acid and metabolic acidosis. Did you have this from a blood test?
Yes, during an exercise test they told me my lactate levels were out of range. (This was arterial, not venous.)
PCO2 range is 35 - 45-mmHg ; mine was
33.8
Bicarbonate range is 22 - 26-mEq/L; mine was
21
Base Excess should be - 2 to + 2-mEq/L; mine was
- 4
Arterial lactate should be 0.6-1.6; mine was
5.6
The first step toward figuring out if you have metabolic acidosis would be looking at some very common bloodwork. What is the CO2 level?
CO2 is taken as a matter of course in my usual every-6-mo bloodwork, so I have a LOT of data saying it's generally low, though once in a while it climbs to 24 (lowest normal) level. I thought I already said that on this thread, but I believe I was thinking of someplace else! I don't see anywhere I mentioned it.
Anion gap:
Hmmm. Now I don't believe I've ever calculated this myself, before. It strikes me that the units should probably all be the same, and they're not. [Edit: they're equivalent; I checked

]
[Na+ + K+] - [Cl- + HCO3].....
[142-mmol/L + 4.3-mmol/L] - [ 107 + 21-mEq/L]
145.3 - 128 = 17.3
According to my
Blood Chemistry and CBC Analysis, this (anything over 16mEq/L) is high.
A reduction in CO2 can also be caused by respiratory alkalosis, which is from hyperventilation syndrome (usually not something you consciously notice). It just means respiratory rate is being regulated oddly.
I ruled this out, Eeyore, based on other data. Unfortunately, my brain-fog makes my brain like a bookshelf that can only hold a certain number of books [Edit: initially, that said, "my brain is like a like a" which is a self-demonstrating article!]. I definitively ruled out respiratory alkalosis at one point, but I can no longer tell you why. As Sherlock might say, "I deleted it". Since I'm a human being and can easily be wrong, this is a bit not good, but I can't help it. My brain really only holds a certain amount of information.
If you have some abnormalities in CO2, then a more thorough evaluation for metabolic/respiratory acidosis/alkalosis can be performed which involves looking at blood gases (either arterial, generally the gold standard, or venous, which is much easier to get to).
Yes! Had it done.
You symptoms of bulging veins sound more like venous insufficiency
Why? And now that you've seen all this data, does it change your mind? Not to be challenging; I'm genuinely curious. This exact symptom is listed as a sign of metabolic acidosis. Why does it seem otherwise to you?
Thank you so much for the thorough grounding in CO2 and metabolic acidosis!
-J