r/stopeatingseedoils is sorta bullshit. wrt r/exvegans, I've known some ex-vegans and there are all kinds of reasons somebody goes off a vegan diet, but if somebody goes off the vegan diet and decides to start preaching how veganism is bad for you and nobody should be vegan I'd consider them sus.

I'm not a vegan btw, although I don't eat a lot of meat. I'd think it's highly unlikely oil is causing your problem unless you're like guzzling it down or something. If oil is in fact causing your issues this is something a doctor can help you figure out, it's not due to the weird pseudoscience that r/stopeatingseedoils ascribes to.

If you're hungry all the time you're not eating enough. Track your calories, make sure you're getting enough calories throughout the day. Many people think they're eating enough when in fact they're not - this was the case with me for a while (and still is tbh).

my poops are never solid and I get tired sooner than I think I should

how long has this been going on? Sometimes your body just gets out of whack for whatever reason. Stress consistently fucks up my digestive system, and then when my stress and anxiety begin to recede I tend to get extremely gassy. The human body is imperfect, and we're not doing it any favors under capitalism. Sometimes your body is just weird. Tiredness and fatigue? Sometimes that just happens. Depression puts me in that state of course. And I can always feel when a storm is coming on because I get a really specific type of deep fatigue that recedes once the storm passes.

But if this has been going on for a while? See a doctor, that's the best advice. You can start eating meat also which it seems like you want to do, but I don't think that's causing any of your issues. Maybe you're just low in certain nutrients as you hint at? Which you can just take a multivitamin for, which would honestly be a more surefire way to get enough nutrients than eating meat.