I've been having a lot of twitching on my lips. What could that be from?

Many causes. Start by visiting your primary doctor for a complete exam. You may also need to see a neurologist or an ent/ head and neck surgeon to check the function of your facial nerve and make sure there are no associated symptoms.
Nervousness, ticks. It could be due to multiple causes as nervousness, ticks or part of seizure disorder. You should be checked by primary doctor and or neurologists.