does peanut butter make you sick ?

I think it is the high fat content.

I can eat it but after three saltines with peanut butter...I AM FULL!!!

 I make my own cashew butter ... although I can eat commercial PB.  Maybe you should try a different kind of nut butter. 

 I can do about 1 TB and sometimes it sits well, sometimes I could puke.

Most peanut butter makes me feel like crap. But, I have found that the walmart brand doesn't make me feel bad. You may just need to try different types.