Please help, I got a problem with my peroneus longus

Every time I run I get a pain in my peroneus longus (I think that what it is) in my left leg. It started in Jan when I started running. It was fine for about 3 weeks then the pain came. I had to leave it 3 months for it to totaly heal and when It healed it tried running again. Same thing happened, for a week or 2 it was fine then a got a pain in left peroneus longus. So 2 months later which would make it this week I went for a 15 min jog. I had a little pain but it was fine. 2 days later which it today I tried to jog but it killed. I run on wet sand, and I have a crap pair of £10 trainners to run in. I give my legs a good stretch before I run too. Anyone got any ideas what I am doing wrong?
 
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