Do you find your anxiety returns while on Zoloft?

I started 25mg Zoloft in September and I have gradually over the last 6 months increased my dose to 100mg. Each time I increase I feel good for about 2 weeks or so then I start waking up with jittery anxious feeling early in the morning that takes half the day to subside. I try to ride it out for a bit but eventually contact my psychiatrist who has felt I wasn’t at my therapeutic dose and would increase me. I’ve been on 100mg for almost 5 weeks now and it was going great until a few days ago. The anxiety has returned :-/… I try to use my coping skills, change my mindset and just go about my daily life. Each time it has returned it’s been more manageable but still uncomfortable. Has anyone else been through this? Should I increase again or ride it out a bit longer. I’m afraid it will never stick and I will have wasted so much time on this medicine … but that’s probably just my anxiety talking.