Gabapentin - Need advice. Does this get better?

After some procrastination, I took my FIRST prescribed dose last night. Dr. started me on 100 mg at bedtime. I woke up in TERRIBLE shape. Achy, foggy-headed and of course, anxiety raised. I am very encouraged by what I've seen here and just want to know, has anyone else gone through this... does it stop? Can't imagine what's ahead as they increase dosage. Waiting for dr. to call back. I need a little assurance that this is eventually going to stabilize. I can't imagine feeling like this daily. I need to be able to function and have not had that luxury in 15 yrs due to the roller coaster ride of being fine and then getting slammed with a bout of anxiety and panic.