Hey tamatoa, sad to hear that you’re in pain, but the best advice I could probably give you is to read the first three parts of Archangels of Magick thoroughly, perform the basic sigil ritual with your full intent and focus, and then trust that the magick is working.
From the sounds of it, you seem to have not followed the instructions laid out in the book, including speaking the words of power and performing the very-important emotional transmutation. Even this relatively basic ritual can be quite effective, so effective in-fact that it may surprise you, and it is well worth your time to learn these basic steps.
Now, I can assure you that this magick works, but it may take time for it to take full effect. I know it’s hard, but do your best to accept that your pain may not immediately go away. If you can embrace patience and not pressure the magick, it will work much more quickly and with much more fluidity.
Also, if you haven’t already I would really suggest that you seek out professional medical assistance. Raphael can work healing wonders, but the archangel can do so much more readily when you are already receiving mundane medical care. Raphael can also help you find a good doctor, should that be a concern.
The basic sigil ritual ought to be sufficient for your current situation, though if you seek to invoke or evoke Raphael in the future, the rituals described in Archangels of Magick are quite effective. I’ve invoked and evoked the archangels many times, but I will still use the sigil rituals from time-to-time should I desire a relatively simple result.
Wish you the best friend