Help! Mystery pain & swelling - I'm kinda scared!

[RolliePollie]

I'm wondering if anyone can help me figure out what's going on. I am starting to freak out because I'm having some really weird pain and I have no clue as to the cause. Maybe a tendon or ligament? And I'm assuming this is cycling related, but it didn't hurt on my last 3 rides. I've been doing longish rides (like 30-65 miles, usually lots of climbing) 3 days a week, plus a little bit of time on the trainer. The pain has been there for almost a week now, and it's gotten a lot worse in the last two days.

So here's what's going on...when I get up in the morning, I cannot put any weight on my left foot. There is excruciating pain in the sole of my foot towards the back of my arch, and it kind of shoots up into my ankle. After I'm upright for a few minutes, the pain starts to subside, and pretty soon I can walk with no pain. But if I sit down for a while, the pain will come back. Then if I walk for a bit, it goes away. However, now the pain is moving up the inside of my ankle. And tonight, my ankle is swelling pretty good and it's a little red. If you press on my foot where it hurts when I start walking around, there is no pain. But if you press on my ankle and up my leg, it is tender to the touch, like if you have bad shin splints. Also, now my baby toe and the one next to it are swelling. If I point my toes like a ballerina, it hurts. But I can move my foot all over in other directions and it does not hurt.

Does anyone have a clue as to what's going on? I'm worried about a blood clot! I do have a small old healed up cat scratch on my foot but it never got infected. It does make me worry about some weird infection though. Now that it's the weekend, I can't go to the Dr. And I'm starting to freak out! Help!!!