I just wish I could understand why I have these crawling, tickling sensations all the time, its only with clothes on, bedsheets don't bother me
What you just wrote reveals a lot. Neurons don't care whether they are being stimulated by the cloth of a sheet or the cloth of a t-shirt or pair of pants..all they know is that they are being stimulated and they pass this message on to the spinal cord (or directly to the brain, depending on the stimulus/area being stimulated), which then relays the info to the appropriate structure in the brain. What happens in MS is that the lesions prevent the normal relay of information and you end up getting tingling/burning/pain sensations when certain parts of the body are stimulated.
Let's say that you did have MS. You have a lesion in your spinal cord that's causing a tickling sensation in your right thigh whenever you're wearing pants. But what about when a sheet is touching the exact same part of your leg, stimulating the very same sensory neurons? Why wouldn't the sensory neurons fire and cause the same tickling sensation? The answer is that they would.
An example (kind of a stupid one, but it gets the point across

)...a man goes to the doctor, complaining that his right forearm hurts whenever he lifts his backpack, which weighs approximately 30 pounds. The man has health anxiety and is convinced that there must be a hairline fracture somewhere in his lower arm. The doctor is perceptive, and after skim reading through the patient's jacket, comes to the conclusion that the patient is a hypochondriac. The doc asks the man about his daily activities and finds out that the patient works in construction. He asks the patient "doesn't your arm hurt when you lift heavy blocks of cement or whatever," to which the patients answers no. This confirms the doc's belief that the patient is simply suffering from health anxiety because from a physiological point of view, it doesn't make sense for a person with a broken arm to experience pain when lifting a 30 Ib. backpack, but not when lifting a 30 Ib. block of cement.
From the point of view of MS, your symptoms don't make sense. However, they do make sense from a psychological point of view. So try to rest easy
