There is a connection to elemental iron and sugar dysregulation. Most prenatals use elemental iron. Better to simply take desiccated liver and eat oysters once a week; ditch the prenatal.

Store bought eggs, chicken, and, (farmed) salmon are basically seed oils. This is a sad and hard reality. Also tied to sugar dysregulation. For DHA, salmon roe is a better risk/return. For Omega 3s, simply eliminate all PUFA and consume your oysters.

If you only quit seed oils 6 months prior, there is a good chance that your fat stores were full of them. Ironically, you probably freed a bunch of that PUFA into the blood by changing your diet. It takes (~4) years to deplete linoleic acid properly. This will probably the biggest factor.

You gained a lot of weight suggesting a pretty deep calorie surplus; probably from too much fat, which likely enabled large scale lipolysis and remodeling of your fat stores, freeing PUFA.

It's awesome that you got sun frequently. Did you notice any skin burning or sensitivity?

The tough reality is that our body sequesters PUFA into our fat stores to protect our organs, but they can be released under certain circumstances, so we need to carefully detox them.

Be willing to bet your issues came from PUFA, both second hand in chicken/pork and being freed from bodyfat. Elemental iron instead of heme was probably an insult too far.