Is Small Bruise On Braced, Ace Bandaged Knee Serious?

Its been about 3 wks. Since I had a brace for my left knee, an ace bandage on my right knee. Not to mention a tape bandage for my right foot. I had been running almost 4 months w/o the proper shoe wear and didn't stretch enough. As a result I either sprained my knees or did something w/my tendons. I recently saw about a week ago a small bruise near the side of my top knee cap, it hurts. I've been stretching, and adding ice, and recently they told me to rub vapor rub and salt for the inflammation. I still haven't gone to the doctors. And just today, I felt prickly ,pin sensation all over my body, I'm not sure if its stress, or the nerves from my knees. I'm not sure if that makes any sense. I have a history of having bad knee problems, since I was a child. I had to undergo treatment to strenghten my knees and any cold hurts my knees, so I keep warm during winter. I plan to go to the doctor's this week, what will they tell me.?