What did I do to my tranny????

[engineco713]

Hey all,
I have an 86 C-20 with about 130,000 miles with a 350 engine and 4 speed with granny setup. I'm not using it as a daily driver but my "new" truck was in the shop so I drove it to work. Upon stopping at 7-11 I went to start the truck and it seemed like the clutch was engaging even though I had it to the floor. I had to shut off the truck to get it to shift into neutral. I was able to get it started and shift but when I pulled up to the first red light the engine was dying out like I had the clutch out. I can't get it into "L" at all, and 1st is a bear, 2nd and 3rd shift fine. So then last night as I'm nursing it home and I go to back into my driveway and I can't get it into reverse while its running. So I had to shut it off and back up as I was starting it to be able to move it. To me it seems like the clutch isn't releasing but someone said it could be a throw-out bearing. I just had the clutch master cylinder replaced about 10 months ago and have only driven it about 1000-1500 miles if that since the replacement. I also read it could be air in the master cylinder but I haven't had any problem before now. Can anyone provide any insight?????