Easy calories?

Somethings wrong with my stomach so im always sick if i eat anything at all and i physically cant eat more than maybe 1 meal and a snack a day so i never get over 300-700 calories, this is no way on purpouse once i eat something i just get too sick to eat again. Im seeing a doctor for an endo soon also . But anyways and when i look up things i always come to this site and you guys seem to know stuff so what are some easy ways to get calories? Peanut butter is one i know of and dosent bother my stomach since its soft bit i dont think its good to eat a bunch of pb to make it to 1300 calories. My doctor suggested vannilla breakfast shakes so i started those but any ideas would be nice so any help? Thanks alot!

I had se thing like that and my doctor gave me ensure it is a nutrition drink that also has lots of vitamins

If you really can't eat, you need to get onto a high-nutrition drink thing like they give people with serious illnesses. Your body needs nourishment. If there's something that you CAN eat, you should be having plenty of it.