My brother has ADD and I feel so badly for him alot of the time. He is VERY smart but has the hardest time managing the 'office' type things of his life. Thankfully he is now dating a woman who is an 'organizer' and a bit obsessed with it! Perfect!!
My brother doesn't currently take anything but I wish he would. He previously had great success with Pycnogonel (pine bark) and Grape Seed Extract together. I think you can buy a bottle that has the two combined. It worked so quickly with him and he was amazed at how much he was getting done each day and how organized he was managing to stay. His memory was improved and he was really getting along well. I think he basically stopped because he is always short on money (though it doesn't cost that much, I think about 20.00 for 60 caps or something at the healthfood store or pharmacy) and as he tends to do, he probably forgot to take it one day which turned into two and then he just stopped taking it.
Hmmm, I think I'll give him a call and suggest he give it a try again! He's been going through a rough patch and this might help.

I'm sorry that you are going through all this. It is hard to remember everything and if you have ADD, it is an uphill battle. Do you think it would help you to keep a mid-sized dry erase board near your desk that you could keep pertinent information on and change it as is needed? You could make notes of what clients get invoiced every two months and what the process is for these folks until it becomes super familiar and then erase that and replace it with the next valuable but hard to remember piece of info.

I don't have ADD but sometimes I wonder if I might have a mild form of it. I couldn't get by without my dry erase board. I'm very forgetful by nature and this allows me to write stuff down that pops into my head and then I don't have to 'carry it around' with me.