Dose - Please Read: New To Adderall and Have Some Questions!

[seasiren88]

I'm prescribed to Adderall IR 5mg which I take twice daily. I've been on this dosage for about four months now.
I know everyone's body is different and reacts differently to different medications but about how many months after starting on Adderall should you normally be able to tell if the Adderall is working correctly?
Like I mentioned above I've already been taking the same amount for about four months now (5mg Twice daily) and at first it was controlling my ADD Symptoms pretty effectively but around the middle of the 2nd month I noticed that it felt like it wasn't working as well as it had the month before.
Since it seems to have stopped working as well for the past 2 and a half months as it did in the first month and a half should I talk to my doctor about changing the dosage strength?
I am a bit scared that I'll be too pushy or seem rude when that's not my intention at all!
Here's how the first part of our conversation goes:
Doctor: "How are you doing thus far on your Adderall?"
Me: "The Adderall is still helping me a little bit but it's not helping as much as I thought it would."
After I say that he just jumps right on to another question and then another.
Judging by the "conversation" above what could I be doing wrong?
All I want from my doctor is for him to listen to me and take notice of what I'm saying to him because to me it is really important.
Thanks for taking the time to read this
Any Advice Is Much Appreciated!