I'd use Arimidex or letro on DBOL, aromasin is a weak AI. I'd also keep Nolvadex handy as some orals, such as Anadrol can increase free circulating estrogen that is unrelated to aromatization therefore a SERM Like tamox or ralox are the only options in this case.
Your friend is suffering from edema aka water retention and this is very stressful on the kidneys and heart, it should be fixed immediately.