I too have positive anticardiolipids for the past 8 years and never had a blood clot. Hemotologist put me on a baby aspirin a day. So far so good. I don't know how high your range is but mine is 27 which is moderately high. I also get some of the same symtoms you get, but not related to the anticardiolipids.
Thought this might help some.
terur
Consider a stroke specialist at a major academic center who can help review your MRI, lab work (hard for me to interpret without knowing the lab's normal values, but macroscopically looks abnormal) and clinical history in detail. Depending on what they find, you may need to be on more aggressive therapy. The symptoms may or may not be related to the same underlying problem, meaning you may have concomitant migriaine headaches. If that's the case, then appropriate treatment should be initiated. If you neurologist is "stumped" as you say, then a second opinion may be helpful in bringing some new ideas to the table. Good luck.