Pushing Through the Pain

So last week I went to see a doctor about some heel pain I've been having since training started. Turns out I've got Achilles tendinitis. It hasn't been too bad. Just some heel pain in the morning, a little after a run and some shin splints. It's been manageable. The doctor said to give up and not do the race at all, but I really want to do it. 

We had training this morning and I was feeling good. I walked rather than ran due to coaches orders. They said they wanted me to walk for the next couple weeks and then try running again. So I did. I walked all 7 miles today and had minimal pain when I was done. I stretched and have been resting since I got home. Now it's like my Achilles is on fire! Pointing my foot, it hurts. Flexing my foot, it hurts even more. Ugh! This totally sucks! If this is going to happen every time after the long run/walk, I'm not sure if continuing down this path is the right thing. I'm so torn. I want to continue but if I continue will it only get worse? 

I have til Monday to recommit to CCFA and the race so I have to make mydescision fairly quick. I'm only about halfway to my goal of $2700 so I still have a lot to raise by November. I've been lazy with fundraising and really need to get on top of it. 

What would you do in my situation? Would you push through the pain and rest when you can, or would you quit and find a new sport that's less harsh on the joints like swimming??