5/6 weeks and super lightheaded and fatigued + lots of digestive changes

Hi all, I’m 5-6 weeks pregnant and have experienced zero normal nausea (my mum said it’s genetic as she never experienced it either when having my brother and I).

However, the past 3-5 days, I’ve been lightheaded and fatigued from waking up to falling asleep. Whenever I stand up, walk (even from kitchen to balcony), sit down etc., I sometimes get so dizzy I start feeling nauseous. I had low blood pressure as a kid (also genetic, my maternal grandmother and my mum both have it) but it feels like a lot of the same symptoms are suddenly back. ):

Even though I’ve almost completely lost my appetite (still forcing myself to eat for the baby), I’m also farting and shitting more than I’ve ever had in my entire life as I always struggled with constipation since childhood. It gets really painful sometimes as gas frequently gets built up but won’t come out until it wants to.

Does anybody have any advice on dealing with these changes? I’m not vegetarian and eat eggs and meat every day but I don’t really eat veggies so I bought some folate to take. Not sure what to do about the almost constant lightheadedness and pent up flatulence pains though. Would appreciate any help! <3