ek@l, It's sad to know that your spouse's F2 and B2 visa was rejected. Consulars in Kathmandu embassy dont need any concrete reason to reject anybody specially spouse. I dont know why they see problem with spouse thosedays. Financial problem/potential immigrant ... are their common reasons and they wanna play with the feelings of the couple. They dont see any problem in issuing visas to even far relatives of similar cases but they are 'negative' in F2 visas.

It really sucks.

It's difficult to get visa again unless your status becomes H1B or at least a TA/RA job in your new admission. If you are trying again, dont forget the corrections to be made both in financial and academic. Good luck and dont give up your hope.