Need a Hud approved or certified buying agent?

I am permanantly disabled and inder 65. I have been approved for a usda/rural development loan but i cant find anything to which fits the requirements and mortgage amount. I could apply for comstruction to permament mortgage loan. No one seems to want to help me. It is available in all states from what i have read on rural development site. And the office i am applying with says they dont process those loans. I am required to use a HUD certified buying agent with 2 years experience. Could someone please help me i have until aug. 23 to get it done. Thank you very much. P.s. i could also use some help applying for grants for nonelderly disabled persons. I am already approved for housing choice voucher and receive it. I now qualify for homebuyers voucher same pha. Ill get a minimum of $505/month assistance from HUD. And I have a C.O.E. OF $117330. I would be endebted forever as it may be my only option left to own a home in my life as i am 52. Could use any help whatsoever. Thank you and have a great holiday weekend and be safe. Thank you for your time, again!!