Hello,
You are a great candidate for reading Jim Humble's book about MMS. In the meanwhile, let me tell you that the 1 drop for 1 gallon instructions apply for water purification, not for any of MMS protocols. The seller obviously and smartly provided the product as water purification chemical together with the instructions. But you have the right stuff, don't worry.
As far as vitamin C supplement, you mentioned in your post, do not combine it with the protocol. If you are concerned about vit C deficiency, load up on oranges, lemons or what ever fruit rich on vit C but make sure to eat that at least 1.5 hrs after your last dose of MMS of the day. They are exemptions to that but you will be on the safe side doing it that way.
With the list of health issues as you mentioned, get ready for a bumpy and rather long road. Every true healing means detoxification and detox is hardly ever pleasant experience. I am going through it myself. Go very slowly. Before you think about DMSO or other boosters, follow the new "Starting Procedure", that is 1/4 of a drop of activated MMS1 (that is the brown smelly liquid you observed) in 1 ounce of good clean water every hour for 8 hours a day. How can you break a drop into 1/4? Activate one drop MMS (as you already did), add 4 ounces on water, mix a bit and drink only one ounce of that liquid. You can throw away the rest and prepare a new dose the same way every hour or you can save the 3/4s in a closed container in your fridge and drink one ounce every hour for next 3 hours. After several days of this, if you don't experience any new problems, you can transition into protocol 1000 by doing the same but slowly increasing the hourly dose to 1/2, one, two and finally 3 drops. Stay on that for several weeks. The standard protocol 1000 calls for 21 days or as long as the person is sick. By then you will hopefully be very well educated by reading the materials from the book, the G2 site and this forum.
I hope this helped, good luck and best of health.
Reverend Libor