ok bro
You HAVE TO BE PATIENT with shoulders my man. I seperated my AC joint 2 yrs ago playing ball...it was a level 2 ALMOST a 3....listen to the doc man. Shoulder take a ridiculously long time to heal, and if you do not give it sufficient time, like doing even light weight benching, you are setting yourself back WEEKS.... and could be worse months if you re-injure the SOB.
Ok with that said, you will develop a small bump in your shoulder where it happened, and it will hurt you from time to time. I can bench now but every once in a while the fucker pops and will get strangely weak for a day. This is rare, but now and again it will fuck with me. This type if injury generally DOES take about 6-8 months to FULLY heal....after 8 weeks you should feel better and have movement w/o too much pain at all....but for it to be 100% it takes awhile bro...
Lastly, an MRI is usually a grand right off the bat. You had X-rays right? Did they have you hold these little weights in your hands? If you had cuff damage or an even worse seperation/tear YOU WOULD NOT BE ABLE TO DO JACK with that side of your torso...hell even sleep would be difficult. I think an MRI would be a waste of $$$ -- in the X-ray you should be able to see that little "gap" where the AC joint seperated....if it is even 1/2 inch it will scream atcha....I know it feels like something is seriously wrong, but lemme tell ya bro, it can be MUCH worse, a torn cuff will make you walk around all slanted to one side lol! You would not be lifting at all, much less shaving or brushing your teeth, do you see what I am saying? You will be fine bro, rest, rest, rest.....hit your legs hard....just do not do squats...