Tingling and numbness in the side of left hand?

A few weeks ago I hit my 'funny bone' on my sister's bed post. I actually screamed because one side of my left arm went numb and felt all tingly and sore for about 10-15 minutes. It soon went back to normal, although it was a little sore from time to time. Ever since then i've been getting tingling sensations and numbness in the exact same place. Nowhere near as strong as when I hit my funny bone, but it's still irritating and I have no idea what it is. I'm just wondering if I hit a nerve and became sensitized to it. Because i've never had this problem before. I'm a fit and healthy 18 year old woman, so I can't think of anything else it could be. Just making sure it's nothing serious! Thanks!!