Reverse sometimes doesn't work.

[TypeX4Sho]

okay well i started my car the other day and i noticed a weird sound coming from underneath the car it sounds like something very small metal or something bouncing around underthere...so i pull out onto my road and the clutch premature engages on me and it stalls..start it back up and its fine the noise is still there its not to loud but its noticable...and i start off again and its perfectly fine except for the noise...get to a stop light about 20 min later and it was somewhat on a hill and clutch was in and i put it in first while waiting and the car will roll back as usual a little but it stopped itself almost with the clutch bein somewhat engaged it felt like so i pulled it out of gear then put it back and it was fine...then got home went to go back it in my driveway and reverse is completley blocked off.... thinkin it maybe the fluid i check it its black but the level is fine..the clutch pedals pressure feels normal...started it up two days later and it will go into reverse..so i drive it around town for probably 10 min and reverse is blocked off again...anyone have any ideas of what it could be??

[TypeX4Sho]

bump....come on guys any ideas?