I read over your post a few times, and I have come to a few conclusions. Judging from the fact that you're on Adderall and Valium makes me assume you may have some psychological issues going on. Also, the fact that you're on methadone tells me you are an opiate addict. You say that your dosage will be 'different', which I assume means lower. Overcompensating for the absence of one drug with another drug, especially something as intense, strong, and expensive as MDA is worrisome. These factors show that you may have trouble making it throughout the day without the use of substances. Taking MDA in the first place is probably a bad idea, because you sound like a person who probably doesn't need any extra added chemical fuckery going on in your brain, especially something as neurotoxic as MDA. If I was you, sobriety would be a goal of mine. However, I am not you, but BL is here for harm reduction, so there's the best HR advice I can give. Get sober.
Being that I am not you, and you will probably do what it is you want to do, here's my advice: Save the MDA for another time. You're trying to use an axe to hammer in a nail. Sure, it'll get the job done, but it's too intense of a tool, the wrong tool and using it for the wrong purpose will cause more problems than it solves. MDA is a fairly intense drug, and should only be used for a party, rave, club, or experience with friends or self exploration. Using it to simply 'have a good day' is overkill, and IMO is a waste of a good drug that can be put to better use.
I'm really sorry, I don't mean to preach, but someone had to say it. Your post just almost seems like a small cry for help. Stick with your therapeutic dosages of everything you're on and stay on the road to recovery. Don't cover up the cravings for one drug with another drug. The whole point of the dosage to your MMT going down is to get you OFF drugs.
Best of luck, and stay safe.