Man, that is all very normal. PT should help a LOT with all of that because they can definitely help with the tightness and swelling. They generally start with a hot pad above and below the knee with an electronic stimulation device to warm it up and get the quad firing after all of those weeks of inactivity. My guy also does a deep tissue massage with biofreeze (deep heat/bengay type stuff) and then will ice at the end of all of the activities. My swelling started going down immediately and was very noticeable even to my wife. I continually ice my leg throughout the day to further help but the swelling you feel is completely normal.
The kneecap thing was a tough one for me too.I would do heel slides or really anything that increased my range of motion and once I would get past about 60 degrees, I would feel what I characterized as a "catch" with my kneecap. It just felt like it was off-track and instead of sliding up and down as I'd curl and extend my leg, it would hang up in a spot and unless I put pressure to hold it up higher during the "release phase" to where it should move, it was EXTREMELY painful. I mentioned it to my PT and he said it could be some abnormality below the cap that is causing the discomfort but it didn't feel like that and I'd never had a problem previously with knee pain of any sort. I asked if it could just be the fact that my quad was so weak that it wasn't holding it high enough and the patella tendon was stronger and pulling it down, because that's what it felt like and he looked at me oddly and said "I guess". That wasn't a ringing endorsement of my diagnosis but it has been spot on. As my quads have gotten stronger and are doing their part in holding the kneecap up, it doesn't do it any longer and I have no pain in that area.
The leg still gets really tight and is tight both above and below the kneecap but I'm waaaaay better today than I was two and a half weeks ago when I started PT. I've been able to do the elliptical for 15 minutes, can spin freely on the stationary bike for an hour, doing leg presses with both legs with 160, single leg with 80, do squats with just my bodyweight until my butt touches a bench and stand back up, and do a slide board used by ice skaters. Now, I sucked doing the slide board for the first time because my left leg has no strength to push off to get to the right, but it's kinda fun and I could feel my muscle working.
So, basically what I'm saying is everything you are feeling is normal and within three weeks from today, you will be doing all of the fun stuff I'm doing and feel way better about your recovery than the very normal anxiety you feel right now. Hang in there brother because you are about to start the real road to getting back to normal.