Scalp hurts

I'm 42 years old, and for the first time ever, I seem to have dandruff, but I'm not certain that's what it is. Is dandruff supposed to hurt? FWIW, I do not use hair products.
About a week ago I noticed a flaky patch of dead skin on the front of my scalp. I found a couple smaller ones, also, after that.
Although I've been careful not to mess with it, tonight I noticed little red sores on my scalp.
Now, yesterday I did shampoo my hair 3 straight times, because I couldn't shake the feeling that my hair just wasn't clean.
One of your questions is about sensitivity. I, in general, am quite sensitive, from feelings of insecurity to teeth sensitivity. (Don't even try to do that 'puff' eye test!)
I have severe nerve pain, so I have a morphine pump, but bear in mind I've been on that for several years. My syndrome is a tying down of my spinal cord due to scar tissue from a successful surgery from spina bifida at 10 days old. (That's a lot to wrap one's brain around LOL)
My state of mind has been chronic distress - a lot of negativity, hopeless, but not quite depression.
Now, I don't think this is related to my scalp, but the posting guidelines ask about other symptoms I'm having, so I'll just throw the rest out there:
I'm very obese (5'2, 194 lbs). I have constant constipation that has led to impaction in the past. Doctors say it's from my prescriptions, and I do plan to take some action when we get paid next week. Also, ocassionally I've gone to urinate and my kidneys begin to severely ache to the point of screaming. I've been attributing it to constipation but I haven't done anything about it yet.

I look forward to your comments.