You absolutely need Aromasin on cycle man. Sounds like you should have done more research. Test converts to estrogen. Aromasin keeps estrogen in check. Start 12.5mg eod asap and adjust as needed. If you run a cycle and skip the AI, you're asking issues and sides. If you're on your 5th week already, I'm betting your Estrogen is sky high. Start that AI immediately and I would highly recommend getting bloodwork done to assess your levels. What dose of test are you running?