Strange things are happening

I am 28 years old and was diagnosed with ADD and Major Depression (secondary), 3 years ago. I do not feel like this is an accurate diagnosis. I have episodes where I isolate myself from the rest of the world and ignore phone calls. I also have felt extreme fatigue and went a whole week without a shower. I am a single mother with a 6 year old and a 10 month old, and weigh 89 lbs. I am 5'3". There will be about a week or two weeks, where I start feeling half way normal but soon after, I do the opposite. I have a decreased need for sleep which has kept me up for 3 days straight. I'll scrub my house, wash the car, but mostly I get all of these new ideas in my head and I can't get my thoughts straight. I will shop excessively and not even regret it unitl a month later. When it comes to complex problem-solving and decision making, I can do it with flying colors. It's the simple every day decisions that are effected. I have been trying to choose what colors I want to use in my living room for 4MONTHS now!! I cannot decide but I just scored a 127 on my IQ test. I don't understand. Slowly I will begin to sink low again and this is a roller coaster that is beginning to get the best of me. I'm constantly in trouble at work for tardiness, lack of concentration on tasks, and lack of communication regarding our accounts receivable. I work for a Psychiatrist so there are times when I have these racing thoughts and I'm terrified that if I were to fill him in on the financials, my thoughts and speech would get tangled up and the last thing that I need is for my boss to start evaluating me. I just sit and think about a million different things in a short period of time but accomplish nothing. I can't take the extreme highs and extreme lows. I have even experienced hallucinations such as hearing music and seeing objects. I have literally gotten up to look for the music. I am assuming that this is coming from lack of sleep. If you have any suggestions as to what is going on with me, could you please let me know?

LLLEEEAAA