Since I am not tax attorney, and from what I understand is that since it is medical expenses. If I remember correctly, that you must spend more than $7,500 on medical expenses EXCLUDED insurance premiums first before you can start write off the rest of expenses on taxes. That's called spend down formula.
Say, if you spent $5,000 on medical expenses, not counting that you pay for health insurance premium, then you can't write off any medical expenses on taxes. But, if you spent total of $10,000 on medical expenses, again not counting the health insurance premium, then you can write off only $2,500 on medical expenses though your taxes. If your on 10% tax bracket, then you would save only $250 dollars on your tax bill after spending $10,000 on medical expenses. That is why tax write off does not really save much money. I would chase down tax credits instead. And sorry no tax credits on medical expenses that I know of.
To be honest, it is almost impossible to win on tax write off on medical expenses. So the actual saving is pretty much like a drop in the bucket. Also, the tax law may have already changed and I might be wrong or still right.