I Have Been Having Episodes That Start With Sweating, Shakes

I have been having episodes that start with sweating, shakes and weakness After I eat, I eventually quit perspiring and shaking; however I feel weak and washed out for several hours after the episode. I have IPF and take Esbriet daily. Otherwise, I am very healthy taking only Levothyroxin, 81 mg aspirin, Effexor and probiotic.