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I witnessed something similar this cycle, never had that before in terms of workout. I have not worked out (at all) for around 10 months and the same day I started again some weeks ago, my cycle started. (which is over a month late then usual, I thought I passed a cycle again this year) I did not start out with intensive training, I know what I am doing in terms of very slowly getting into lifting again after a longer pause. Seems this time I angered my CH - I have since tried again to workout on 2 more occasions with very moderate units in the morning, the hits the following night where absolute horrible with high frequency and took a too long time to abort with o2. Very odd - I´ll test on some more days but need to prepare already that another thing that brings joy and would be good for me is not allowed. I know that there are many posts here stating that intense workout does not abort for them but actually trigger an attack. (I am not triggered after the training in the morning but it starts early at nighttime) My neck feels worse as well during attack build up. My theory right now is lifting tingles a back / neck nerve involved with signal paths to the trigeminal nerve or what ever. Our cases might be totally unrelated, as usual the disclaimer we are all different but still leaving my experience here.

Intriguing stuff, tmac, I'll be following your updates with interest.

I use a lot of O2 and the only time I thought it was not effective is when the tank was near empty. I don't know why, but the first O2 from a full tank is much more effective than the bottom.