You can also check with the pharmacist to see if you can cut the pills so you can start with a lower dose. Sometimes this helps with the side affects. It allows you to slowly adjust the dosage. You need to check with the pharmacist because some pills should never be cut in half. Of course, if it's a capsule, you're stuck.
I've done this before with some meds and it helps a lot. Cymbalta is not like an antibiotic where you need the full dose. Unless there is a reason to immediately start a high dose, it won't hurt to go slow.