Hi, good to see you! You are describing something that up to 80% of MSers will suffer from at some time in their course. It isn't always incontinence and may include retention. I wrote a Health Page on the neurology involved. It might help you understand some of what may be happening to you.
http://www.medhelp.org/health_pages/Multiple%20Sclerosis/The-Neurology-of-Bladder-Incontinence/show/758?cid=36
First, you have to let your doc know about this. There are things to check out and a couple avenues to try. Lulu is correct about needing a specialist. For a woman I really do recommend a urogynecologist like she mentioned. First off you need to be checked for a urine infection. You can have a urine infection without any other symptom than incontinence.
We already know that you have stress incontinence a common problem of women who have borne children or are overweight and can happen in any woman.
Your new symptom is urge incontinence. This can be a combination of problems from strong spasms of the bladder to expell urine or weakness of the spincter so that you can't hold all of the urine back - or a combination of both. You will need a series of tests called "Urodynamic Testing" to know what the problem really is.
Yes, there are treatments. The first thing that a good doctor will want to try is Incontinence Physical Therapy. Fifty percent of women with urge incontinence and MS will benefit from PT. This may be dedicated work with the Kegel exercises or biofeedback or electrostimulation in combination with the first two. I wrote a journal on my experiences with Bladder Physical Therapy and made them into Health Pages. They haven't been widely read ut, here they are nonetheless.
http://www.medhelp.org/health_pages/Multiple%20Sclerosis/Urinary-Incontinence-Physical-Therapy---Part-I/show/759?cid=36
http://www.medhelp.org/health_pages/Multiple%20Sclerosis/Urinary-Incontinence-PT---Part-Deux/show/760?cid=36
http://www.medhelp.org/health_pages/Multiple%20Sclerosis/Urinary-Incontinence-Physical-Therapy---part-tres/show/761?cid=36
The treatments for incontinence include exercises, biofeedback, medications, self-catherization, Botox, and surgery. It all depends on why the problem is occurring. That's why it is so important to have the Urodynamic Testing.
My Urge Incontinence which had indeed improved with exercises has returned with a vengence. I'm again doing the exercises, but I'm worried that something more has happened neurologically. When I had the testing I had a spastic urethra at the same time the bladder wanted to contract, a combination of things called Detrusor (bladder muscle) Sphincter (muscle around the urethra) Dyssynergia (not working together).
Once I get the car adapted I can drive myself to the PT appointments - that's why I stopped going. My sister was involved daily in the construction and couldn't drive me.
I soooo sympathize with you. I hope it either goes away or they can help.
Avoid bladder irritants like caffeine and acidic foods like orange juice. Some docs also include the hot, spicy foods. My didn't.
Meds are an easy fix and heavily advertised on TV. They can cause lots (read that LOTS) of side effects like dry mouth, constipation, double vision, etc. I recommend trying the non-drug and non-surgical methods first.
Quix