Please don't panic when you read this! :
There are loads of things which could cause such sensations but, when unusual symptoms are felt mainly just along one side of the body, there has be some suspicion of problems within the brain. Now, please remember that I said DON'T PANIC! The chances are that there's nothing serious wrong. There could be a completely different cause but I still strongly recommend that you see a doctor as soon as possible just to be on the safe side.
Before you start panicking - I SAID DON'T PANIC! - let me give you an anology in terms of likelihood. Over the years I was in charge of first aid in a secondary school, I had loads of kids referred to me with abdominal pains. (I know that abdominal pains don't fall within the remit of 'first aid' but that didn't stop my colleagues from sending the kids to me!). Whenever there was the slightest possibility that it might be appendicitis, I ensured that the child was conveyed to hospital as quickly as possible. (It would have been irresponsible of me to do anything else). The number of kids I got checked out must have been into three figures but only one of them actually had appendicitis!
So, in answering your question, I'm following the same principles. Having recognised the possibility of a problem within the brain it would be irresponsible of me not to strongly urge you to see a doctor without delay. This is definitely not the same, however, as saying that there's actually anything serious wrong!
Chris