Jaw pain and headache after getting porcelain veneers and crowns. Do I just need some adjustment time?

The effects on the muscles and TMJoints from a long dental appointment can be an initiating factor in developing TMJ Dysfunction (TMD).  Research has shown up to 50% of TMD begins after long or difficult dental appointment. I suggest a short term TMJ or Bruxism appliance ASAP,  The Aqualizer is ideal.If the pain continues have your bite evaluated by a neuromuscular dentist.

I would suggest another adjustment or two on the "bite" and a sleep study if symptoms persist as you may have an underlying sleep breathing issue causing the TMD symptoms.I have found very fast relief (12-24h) using Botox injections in the jaw bilaterally lasting 2-4 months.  This will not stop your bruxism but should give you relief until the proper dental or medical diagnosis can be completed or you "get use to" your new dental work......

Hi:You might need:1.  Additional adjustment2.  Nightguard3.  More time for the bite to settleBest,Dr. Maddahi

There may be a problem with your new bite, however the most likely cause for your pain is having your mouth opened wide, wide enough to have dental work done for long period of time. Some can only tolerate short procedures being done in a single appointment or they will have post-operative jaw pain. If you recall your jaw or joints beginning to ache or become fatigued during this dental appointment, it is very likely that 
If this the cause of your pain, you will find:
You have pain when you open wide   You have pain when you bite down or clenchYou may have pain in or near your ear, temples, back of your head, eyes, shoulders, shoulder blades
Start by treating this the same way you would treat a sprained or strained ankled...
Rest - this means a soft diet, no chewing gum, nuts, ice, etc Medicate - with over the counter pain relievers that have anti-inflammation properties like ibuprofen, up to 800mg every 8  hours if this is a drug that is safe for you to takeWarm compresses t-help surrounding muscles relax
If you don't experience some relief after several days of committed rest, it is reasonable to consider other causes. It is also important that you wear a protective guard if you are clenching your teeth, to keep from breaking your new veneers.