Ent often for some reason is harsher and can cause more sides than cyp. Its fairly common for people to have negative reaponses to it. I prefer cyp or prop. Haven't had the pleasure of trying sust yet tho.
Maybe try a different ester or a different brand, could be many things tbh. Best bet is to jist try something else. You could also split dose, once every 10 days is not a great protocol. You would be alot better doing 100mg shots or 125. Is your estrogen high?