Hi there! First of all, I am sorry to hear about your struggles. I know it can be a difficult field to get in to because of how competitive it is. There are so many people entering with ridiculous GPA's that it really depends on who you are applying with and competing for a spot with. I too have been an SLPA for quite a few years now and although that will assist you once you are in grad school, getting there may be difficult unfortunately. I don't know if this is for all schools, but I do know that the majority do not take your post-bacc classes in to your GPA account UNLESS they are part of a degree program. My suggestion would be to try to get in to a second degree program. The University of South Florida has one online where you get a Bachelors of Science degree in CSD, and it is very good. Since you have taken some classes already, maybe they will transfer over? Florida International University does not look at GRE scores, but GPA may be difficult. If you are bilingual you have a better chance of getting accepted quite honestly since it is a bilingual program. Aside from that, it will be difficult to get an acceptance with a 2.86. I would seriously consider looking at a second degree. It is one thing they do not tell you with those bridge programs is that when applying for your masters in SLP, majority (if not all) do not consider that as a GPA. I know a lot of people that took classes to boost GPA, but because it was not a degree it did not matter in the long run. It is very unfortunate.
My biggest advice to you is to pursue a second degree in Communication Sciences and Disorders (assuming your first degree is not in this!). It will take less time and be cheaper over all than just taking post-bacc courses. Good luck!