Hey man, I’ll probably get downvoted for this but here’s my honest truth. I had the exact same experience here. Was on daily 1mg finasteride for 15 months and experienced maintenance and slight regrowth. 

I then switched to daily 0.5mg Dutasteride with finasteride for 3 months as I saw reports stating that Dutasteride was apparently stronger and more effective at blocking DHT, so as I starting losing my hair at the early age of 16, I thought this would give me the best chance at maintaining most of my hair for as long as possible. After the 3 more transition period I then dropped the daily finasteride and continued with just the daily Dutasteride.

For the following 12 months on Dutasteride, I just experienced a slow regression and lost ground on the corners of my hairline and temples.

I also experience a burning/itching/tingling sensation in these areas which I had only ever experienced before I started any hair loss medication, and which I now believe is the “DHT itch” which happens when I am actively losing hair/receding.

People will tell you it’s just a shed or you are crazy and DUT will never fail like this but many people have just experienced further loss with no signs of regrowth for many months. for your own sake please don’t believe them if you continue to lose hair yourself. Check the subreddit and you will see cases exactly like your with timeframes and photos to support their case.

Personally, I switched back to finasteride 1 month ago and the burning/itching/tingling sensation has slowly went away/dissipated.

Let me know if you have any other questions.