climb into the clouds, knowing you've done some IMC training, but haven't got an official rating, call a PAN and get some assistance to an airfield were you can make a cloud break and land on something proper?
Even with an IMC i'd seriously consider a PAN call in this situation. Things have obviously started to go wrong if you have to make an unplanned trip in IMC, so you might as well have all the help you can get. Without an IMC it's a MAYDAY.