27 years old . 5'9". 215 lbs. 12-13% body fat.

Just started my first cycle of enanthate only at 500mg per week. I'm pinning Thursday mornings and Sunday evenings @ 250mg each. I wasn't taking anything else as I was hoping to avoid using arimidex if I could. Around day 9-10 I started experiencing weight gain, despite my nutrition and training staying the same. My feet and hands felt swollen and my nipples started getting slightly puffy. I started taking 0.25mg arimidex EOD.. just took my second 0.25mg dose today. Should I be worried about crashing e2 or should I Up my adex dose to 0.5 or even 1 mg EOD or ED? Can puffy nipples be from water retention due to the test? Or ia it surely high E2 already? High E2 after just 3 pins of 250mg test? Anyone else out there aromatize like crazy? I don't wanna crash my E2 but I really wanna avoid gyno of course.