Have Cat Questions? Ask a Cat Vet Online.
Crystals in the urine are pretty common but can be controlled with antibiotics and a special diet that prevents the formation of stones.
For the anal glands, even if they are expressed, they can abcess or be infected. If this is the case, antibiotics WILL show improvement but they might be needed long term.
You should also keep in mind that licking can be caused by an allergy to fleas, products, dust, pollen, grass, etc. If you suspect this, you should talk with the vet about using an antihistamine to curb it. Your pet might also benefit from a diet change to a low allergy prescription diet that you can get from the vet.
Let me know if you still have questions.