Getting into guilds capable of doing heroic modes

Okay here is the background. Towards the end of cata I got into a guild that killed Madness HC @ 10% nerf as a shammy healer. Did fine with the trials and was looking forward towards some MOP raiding. Real life interfered and I was not able to do squat in MOP and that guild subsequently collapsed. I will get back into WoW in May. The problem I have is that the people who knew what I was capable of xferred off server. I don't have much of a raiding resume in MOP (I have not even completed LFR in Tier 14 though I do have a char at 90 with both professions maxed) and the overall process of recruitment does not revolve around "potential". I have good raid awareness and I am good under pressure. I could raid with some guilds that are currently 6/12 Normal but that would be a depressing experience. I spent majority of my wow career before I got into that guild surrounded by players, who may have been nice people, but not terribly good at wow.

So what should I do? Should I give up healing and learn one dps to extreme?(I have a shammy @90, lock,hunter,mage,dk,druid, pally @85. Leveling wont be an issue)