Good suggestions from kat'. When you mention the "new D3 regimen," does that include Benadryl? If not, I'd include it. (I think the recommended dose is 25mg four times a day.)
For some people, when an O2 tank gets low, it seems to lose effectiveness. "Low" can be 1/4 left, or maybe even more. Higher flow rate seems to help with that (new tank is of course better).
Is your pred dose pack a Medrol Dose Pack (the most common kind)? Often the pred levels can be too low in that to really be helpful.
Relpax is a pill, right? If it is, I'm surprised that it helps you (but glad it does).
Energy shots (such as 5-Hour Energy) have a lot more caffeine than standard energy drinks (such as Red Bull).
You can get advice about RC seeds here, if you're interested. Legal to buy and possess in most US states and many countries.