Dizziness

Has anyone had any episodes of extreme dizziness? I've had it a little when I stand up too quick and things like that. But I was just at the shop and while walking around I just started feel generally uncomfortable, bit of back ache, stomach felt heavy (even though I only have a small bump at 14 weeks 😅). Then when I was standing at checkout and the lady was scanning all my stuff I suddenly felt worse and worse, feeling really dizzy, sweating, felt like I was going to throw up, couldn't breathe properly. Really think I was close to passing out. I ended up saying I'm so sorry I don't feel good and sat down. The lady got me some water and thenafter maybe 5 mins I felt pretty much fine. I feel a bit "floaty" now and not 100% but haven't felt 100% the last 14 weeks anyway! Just wondering if this is normal or if I should call the doctor to be checked? I know dizziness is normal but not sure if it is to that extent. I had eaten plenty and always drink so much water so I don't think it was low blood sugar/dehydration. I have been very very tired recently but I have a 3.5 yo so not much I can do about that 🤦🏻‍♀️ This was also the first time I'd gone out today and had previously just been sat at home working so don't feel like I over did it