It Doesn't Go Down Anymore

OK, so here’s the story: My friend from Oly lifting kinda lost his drive recently, so in order to psyche him up a little I just did some Arnold-style shit with him (high volume curls with moderate weights back to back) Well, It’s been 3 fucking days and I can’t really extend my arms above ~120 degrees(not the usual soreness and decreased ROM).
Did my stretching afterwards, felt OK that night, took my protein, yada yada yada.

Any takers?

Edit: Talked to my doctor yesterday, said it was a blockage of the brachioradialis, treating it with mucle relaxants right now. Doesn’t feel much better though…