What Causes Popping Bubbles In Legs?

Hey, I got a problem since 2 weeks (after a flight to Berlin). I feels like bubbles popping in my legs (and sometimes my arms), mostly when i relax, in bed or sitting. It s a mysterious feeling. I ve been to the doctor here but they can t help me. I m worried it s something serious, like MS or decompression sickness. My right leg (calf) has also been weird, like numbness (my foot hurts since more than 6 weeks-doctor said i need insertion.) And other feelings: right elbow hurts (axil), screaming in my right ear (the other night) just for 2-3 minutes and then gone. Is this dangerous??? What could it be?