If you have flat feet you NEED good quality supportive running shoes. Can you find a specialist running store that will watch you run and analyse your style so that they can find you the right shoe? That is what you really need. People with flat feet can run, so don't be afraid there, but without the right shoes, your feet are transferring the pounding energy into the wrong places when you run, and this can give you ankle, knee, hip and back problems.
Ladies on here with a similar or greater weight have run so it is not necessarily your weight that is the problem. Take your DH's advice and get some good shoes, then if you still have problems think again.
Also, I don't know how long you have been running, but 3 miles for a beginner seems like an awful lot. I've been running for over 5 weeks, and I am still doing walk/jog intervals, with my longest running time at only 5 minutes. My body feels like it could do more, but we have to be careful and give time for our bones and joints to catch up.
I hope you get your pain sorted out and good luck on the running!
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