i suggest you find someone more versed in the black arts of apache directives and get them to fix it.... i myself merely dabble and am hardly an expert...

i further suggest you put all of your websites under version control. that way it is far easier to go back to when things worked. it requires some effort to learn git, but the advantages going forward are great. i use bitbucket as a repository for all my source code. makes changes to working websites far less stressful.

good luck.