Nails are similar to hair and I would suspect that your nails have ridges. It takes about 9 months for a nail to grow from the nail bed to the end of your finger. So if you have nail ridges, they will be there until your nail grows out to the end of your finger when you can trim off the ridged nail. Nails most often reflect iron status in your body, but are also effected by protein status and fever. Considering your history of Crohn's, protein absorption may not be optimal in your remaining small intestine.
Protein is absorbed as amino acids in the lower duodenum and the jejunum.
Go to web site for lupus by Hamline University in St Paul, Minnesota for more information about lupus. The vitamin shots will not stop your hair loss as vitamin B-12 is not involved in the growth of hair. Vitamin B-12 is absorbed in the small intestine as well, so taking the shots bypasses absorption in the intestinal tract. You may need these shots for the rest of your life. Vitamin B-12 also functions in maintaining the cover surrounding nerve fibers and a deficiency would cause paralysis of nerves and muscles starting at the hands and feet.