Could I Have Offended A Ghost In The Alley?

Some strange things have been happening to me and I would really like to hear if you think I am being haunted. I have never seen a ghost in my life and I didn't ever give them much thought, except for sometimes watching scary movies, until recently.

Last month when I was walking home from classes at my college I took a shortcut through an alley I had never been down before. Halfway down the block it felt like I ran into something with sharp edges. I was really confused because there was nothing around for me to run into. I just stood there looking around trying to see what I could've hit but there was hardly anything in the alley. The closest thing to me was a dumpster and it was like five or six feet away against a wall. I got really scared because it just didn't make any sense. I practically ran the rest of the way to my apartment. When I got there I told my room mate about it. She asked me if it still hurt and I said a bit so I lifted my shirt to look at the spot on my stomach where it felt like I ran into something.

There was a bit of a scratch like you would get playing with a cat but bigger and the skin was lightly bruised along the scratches. We talked about it for a long time. We talked about hidden alien spaceships and things made invisible by a sorcerer but it all seemed so silly. We had no idea what it could have been so I just decided not to walk down that alley anymore.

A few days later the strange things started happening. I will list them in order as best as I can recall.

1.) I was sitting in the living room watching tv when my rack of cds fell over on top of me, there didn't seem to be any reason for it to fall.

2.) I was at my desk on my computer when my dictionary fell off of the shelf from the wall behind me and hit me in the head. The shelf is wall mounted and it was like seven or eight feet from where I was sitting. None of the other books on the shelf fell.

3.) I was walking across the green at school when a rock hit me in the stomach. I don't know where it came from. There were other people on the green but nobody seemed to be throwing things.

4.) I was walking home when a small potted cactus fell from a window above a small shop and just grazed my leg before shattering on the sidewalk.

5.) I was getting a pop out of the fridge and my bottle of vitamins fell and hit me on the wrist.

6.) The lamp on my bedside table fell and hit me on the foot while I was laying in bed watching tv and I wasn't moving around.

7.) I was straightening my hair in the bathroom when the mirror of the medicine cabinet in front of me flew open and hit me on the side of my head.

8.) I was sitting at the bottom of the steps putting on my shoes to leave for class and my room mates tennis shoe, which had been on the landing about five steps up, hit me on the back of my head.

I know these things happen but I have never been accident prone and they seem to happen every three or four days. My room mate and I started to wonder if a ghost was behind it. I read several stories on this web site and it seems like some of the commenters have studied these things. So I am wondering if you think a ghost is causing these strange things? Could I have offended a ghost in the alley? Also can ghosts have invisible objects with them, because what I ran into did not feel like a body at all? I am really confused and I would like to hear expert opinions.