i would definitely talk to a pdoc about it. there is a such thing as mixed episodes of mania and depression which may explain your alternating lethargy and energy. the spending is also a symptom, i'm sure you know that. it can't hurt to get checked, the earlier you begin treating it the better. good luck.
Sounds like classic BP to me!! I would go for an evaluation and tell them your symptoms! You have a daughter to think of and need to be stable for yourself and your child. Good luck!
I am 47 and just started showing signs of BP. I had a baby on my 40th bday (alone-hubby bailed) and ever since I have had major chronic fatigue and mild depression. after trying anti-depressants i started going manic on them so the doc put me on lithium once a day. that helps with not flying off the handle so much. my mom is schizo, and my sister is BP but i never though i would get it. i was always the responsible one. now the doc wants me to take 125 mg of depakote to "calm me" but it makes me feel wired. not the effect he was going for. my little 7 year old son has adhd due to the abuse i received from dad while i was pregnant. amazing how stress manifests it's self in strange ways.