Toocool.
I have many thoughts on that too. One of them is, men are more likely to be given a "real" diagnosis of something else, and not a "bucket diagnosis" (no offence meant, I've been in the situation of having my symptoms dismissed, solely I believe, because I was a young female).
Also, across the board, women are more likely to get autoimmune/immune conditions, yes probably hormonal but also due to how our immune systems are primed to change in pregnancy.
Another thought I have, is that the above things, combined with modern diet, causes a lot of problems. Women (my observation) tend to eat differently to men, in a way that might be damaging... they eat a lot more low fat "healthy" products which tend to be lower in essential nutrients, but higher in processed carbohydrates/grain fibres, artificial sweeteners and other additives.
IMO none of that is great for gut health and many illnesses and conditions start with a damaged gut.
OP, it's interesting you mention SPD while pregnant. Do you have any other signs of (potential) collagen defect/disorder? I.e. Hyper mobile joints, stretchy skin, paper-tissue scars, bruise easily?
There's a big overlap in collagen disorders such as EDS, OI, "benign" hyper mobility etc and ibs, fibro, ms, me, thyroid, coeliac, and other autoimmune conditions - diet is very much relevant to people with collagen disorders, as the function gut may be affected by the wonky collagen.
Unfortunately, an almost vegan diet is likely to be extremely high in gluten, phytic acid and insoluble grain fibres, and for a lot of people that's not great, for a lot of reasons.
I have a (genetic test confirmed) collagen disorder. Diagnosed in my 40s, after decades of medical problems, many of which were dismissed by hcp as "all in my mind".
About 7 years ago I cut out all gluten containing grains completely, adopting a Paleo diet. I'm not veggie but it is actually possible to do veggie Paleo (have a look at Marksdailyapple blog, it's very good, sensibly written, plenty of veggie advice even if predominately not veggie. Lots of recipes). ALL of my many health niggles reduced significantly or disappeared altogether within a couple of months. They stay away as long as I keep to the diet (I limit even gluten free bread/pasta because they tend to trigger headaches/migraine if eaten regularly, I think it's a reaction to the xanthan gum in them).
My health niggles included- frequent migraines and daily headaches (since mid teens) , balance problems, brain fog, skin problems (strange rashes, deep cystic spots, rosacea), joint and muscle pain, awful fatigue and pain with little or no activity, ibs (since mid teens). I had SPD in each pregnancy to the extent I was walking with sticks and in a LOT of pain.
IF you do decide to give Paleo or Paleo autoimmune protocol (or any other exclusion diet) a trial for a few weeks - it would be sensible to consider having a coeliac screening test BEFORE you cut out gluten, unless you have had a negative test within the last couple of years.