I cannot give you the best opinion without seeing your scans directly
what I get from your story is ?you had a traumatic brain injury from the accident, then a further bleed in 1995 requiring another brain surgery. Was there any evidence that there was an underlying vascular malformation (for example by an angiogram or MRI appearance).
When the MRI images old blood the MRI signal comes from iron left in the tissue from the breakdown of blood. This usually remains for a long long time. Certain type of MRI images (such as 'gradient echo') are very good at picking this up - but it does not mean that there is a new problem. Blood that is not chronic, but up to several weeks old will appear differently on MRI, allowing the distinction between blood that is new to several weeks old, or the residua of an old bleed. The old bleed or trauma could have the potential to cause seizures as seems to be the case, but should not have a significantly increased risk of bleeding unless there was an underlying vascular malformation. An angiogram could answer this question
I dont know why the old bleed is showing up on the MRI now. As I mentioned earlier certain types of MRI scans are more sensitive at picking up blood, and there is some variability in the quality of the scan and its interpretation.
Good luck
I forgot to mention that the headaches I was encountering went away at first but now they're back. The reason I sleep so much is from the headaches. Nothing seems to make the headaches go away.