I changed from 140mg down to 100mg (split into 50mg 2x/week like you) 5 weeks ago and experienced a very similar experience.
I actually ended up in Urgent Care last Friday after basically having daily panic/anxiety attacks the entire week. EKG and blood tests came back "normal", they said it didn't appear anything cardiac related and must be due to the drastic reduction in dosage of my TRT.
Unfortunately, in my case, it hasn't gotten much better by week 5. I'm due for 6-month labs with
Defy tomorrow morning and fear that there's going to be 3-6 weeks wait to consult with Dr. Saya... there's just no way I can endure what I'm currently feeling that much longer, so something's going to have to change sooner than that.
I did not experience this when lowering from 160mg to 140mg, so to me, this seems like 100mg is just too low for me.
Wish I had better news, but I've heard it around here that reducing dosages significantly can be hell, and in my case, that's proven to be true.