Sounds like it's had it's day then, unless you fancy taking the laptop apart (not for the faint hearted) to see if you can find the problem. Is it still under warranty or is it past that? You can either get an external mouse to take over from the trackpad and regain your right click or you could send it for repair, either back to Dell or find a local shop that might be able to help.
Afraid that's all I can think of
Paul
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