Need some Stihl FS90 Trimmer help (im an idiot)

yesterday I took my tractor over to my inlaws to help her tame some tall pasture grass. I have some brackets on my ROPS to haul my stihl trimmer on my mower for just such an occasion that are similar to those tool and rifle brackets that guys use on ATV's. Long story short is I didn't realize that when I hit a bump the head end of my trimmer came dislodged and was only hanging by the motor end attached to my rops. When I went to raise my deck (which also raised my 3ph) the shaft of my trimmer got bound in the rear implement and put a bend in my straight shaft. I was able to put the trimmer on the ground and get it pretty close to straight but there is still a very slight "s", zig/zag, bend, or whatever you want to call it in my fs90's straight shaft. I started the trimmer and tested the throttle (probably not smart in hind sight) and every thing seemed to work fine and without any binding or grinding noise. My question is 2 fold. 1. is it ok to have a little bend in my trimmer shaft? Ive also got a curve shafted fs55 but I think the drive shaft in it is a flex cable that drives the head but I was under the impression my fs90 had a solid drive shaft to run heavy duty implements? I cant find any good parts diagrams or lists online and was wondering how hard and what kind of cost to replace my trimmer shaft and drive shaft if needed? Open to any insight and info I can receive. thanks gang. If I need to post some pics I will just let me know.