i understand where you're coming from, and i'm sure it's discouraging to have put on weight with the back problem, but steroids are not the answer. 6 weeks of anavar and you're probably going to need a serm, and places like rxhealth take sometimes (seems all orders lately) as long as 7 weeks to get shipments delivered. that said, i think it would be a miracle if you ordered a serm and it got to you in the next 3 weeks.
you DID post prior to this in the anabolics section, it says so right in your profile statistics. and everyone in that thread told you not to do it.
your "buddy" who suggested anavar to you, does not have your best interests in mind.
you're running 6 weeks on a methylated oral. are you taking any support supplements?
when your back started feeling good enough to work out again, that doesn't mean jump on the juice. athletic or not, 246lbs at 5'11 is HEAVY. the fact that you don't know what your bf% is, or even what HPTA is, says you were never ready for this cycle.
order an unleashed/post cycle combo from needtobuildmuscle.com, then get yourself some sustain alpha or forma stanzolol. start all of these the day after your last anavar dose and you should be ok.
BUT, as mentioned, 6 weeks is a long cycle, and it's possible you'll need a serm, so order up some toremefine citrate from one of the sponsors and keep it on hand to use if you're not recovering fast enough with the OTC pct.
next time, make informed, intelligent decisions. if you didn't know you needed a PCT for an anabolic steroid, then you did NO research. IMO, you will be disappointed with your results. it's not a miracle drug, and if your body fat is high i would bet dollars to donuts you won't see the vascularity, hardening effects that anavar is so well known for.