I am online and happy to help you with your question today.
Yes, it is possible that what you have described is an umbilical hernia.
The best way, of course, to figure out what is going on is to visit your regular MD and have her take a look at the area of tenderness and swelling. If it is a small umbilical hernia it shouldn't be very difficult for a surgeon to fix.
Does this make sense to you?
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I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)