You shouldn't exaggerate the effects of your welding rod toxicity in hopes of getting a greater settlement in court -- but don't downplay them, either. If you notice symptoms like those of Parkinson's disease -- numbness, shaking, etc. -- have yourself checked out immediately.
Don't make your doctor guess what's wrong with you if you think you may have welding rod toxicity. Tell them straight out that you're at risk, and give them all the other information that they need to make an accurate diagnosis. Even if it turns out to be something else, you will have eliminated one possibility.