So I'm 14 weeks having issues. 😫

Hillary
And I eat like once a day. Two maybe. But usually 1 and some snacking hear and there. I don't feel good like ever. I'm always feeling nauseous after I eat so I just don't eat until im starving. And then I feel like shit after. So I feel like I'm not providing adequate nutrition. But food just doesn't appeal to me unless I have a specific craving. Which recently has been tortillas and chees dip. 😭
So on top of not eating right , I can't excersize. Why you ask? Because if my heart rate gets elevated in the slightest amount I start gagging and dry heaving and I puke if I don't get it down fast enough. I don't understand why? I used to do cardio ( not a lot) but when I did I didn't feel sick. My heart rate has always been kind of high I think but never caused me issues. 
But I'm just worried I'm hurting my baby and my self because I'm not eating and I can't even walk briskly without going into a puking fit
Anyone have any similar issues ?😭😭