Will IGF-1 go down to normal after stopping growth hormone replacement therapy?

Hello doctor,

I am a 20-year-old man who has used growth hormone replacement therapy, Somatropin, for a year to combat asthma. I made an error in my original dosing and now have learned I have been overdosing (approximately 20 mg per week). Three weeks ago, I started to feel fatigued. I could not concentrate at work. Stopped the medication. Yet three weeks after stopping RHGH my IGF-1 is still 2.2 SD above normal, at 500. My GH readings are basically zero (.2), indicating that the IGF-1 is suppressing my natural production. Three weeks ago I developed brain fog, a disconnected feeling, so I stopped the Somatropin. Currently, I am taking just asthma medication (Advair). But I still feel very fatigued and cannot work. I have cut back on proteins. I have three questions:

1. Will the IGF-1 go down to normal, and how long?
2. Is there a medication that can lower my IGF-1?
3. Is the fatigue from constantly high IGF-1 or because I am not producing GH?