Try un-installling the version of LimeWire you have and re-install with the most recent full release 4.16.6. I can't say why you would have your connection to the net completely closed. That is a strange problem...
Another good thing to do is to scan your computer with a reputable virus scanner to make sure your system has not become infected with any viruses or trojan horse files.
You can even get the highly reputable AVG free version from grisoft. And it will scan your whole computer and let you know what the score is.
Are there in fact a lot of people uploading songs from you or are you just assuming that that is the case?
You can check this by looking at the monitor tab within Limewire.
Read as many of the "Sticky" posts as you can. Maybe among them is an answer that will help you.