Have just read through this thread and wanted to tell my story. in fact i did start a thread on mumsnet a few months ago called 'panic attacks when driving (motorways); although when i looked for it a while back it seemed to have disappeared.
i used to commute on motorways, driving distances of 40-60 miles as i was on training placements around the place. sometimes i drove from southampton to the lake district for a long weekend hillwalking on my own. never thought anything of it.
when i was pregnant with DD, and DS was small, i had a couple of bad experiences on motorways. i didn't have easy pregnancies and in both the bad experiences i nearly fell asleep at the wheel. i was only 3 - 6months pregnant but truly exhausted, trying to work, travel to london for a course etc etc.
after DD was born, world shrunk, didn't go very far. when DD was 5 months old i tried to take the two of them to see my parents 200 miles away. i hadn't driven since one of the bad incidents, but as i had been driving for years i didn't predict any problems. as soon as i hit the motorway i had a panic attack. it was truly awful. i tried all the relaxation strategies i knew, managed to go about 20 miles. but was utterly exhausted. stopped and drove home on A roads. i was utterly exhuasted, DD was for months, nay over a year, a terrible sleeper, and i'm sure this exacerbated it. i had had a difficult birth and i think the panic attacks were a symptom of post natal anxiety coming out.
i have tried counselling, which i was down for anyway, hynotherapy cds, which did make me feel much more positive and driving lessons. incidentally the driving instructor said my driving was fine and perfectly safe, except for once when i pancked and slammed on the brakes.
my problems are not with traffic - they are with space, going over bridges, long bends, exposed sections of motorway or roads generally and having vacant lanes to my left, for example if there are lanes turning off. i can drive on much more dangerous country roads and through city centres i and know that motorways are generally safe.
i tried forcing myself to try and conquer it. but this has just made it worse tbh, it started spreading to dual carriageways etc.
doctor prescribed me valium as i can't have beta blockers , but i don't want to take it, would rather avoid the motorway altogether.
DD is nearly 2 and hopefully as she grows up i can make further progress. but i have to take the pressure off myself. forcing myself to drive through the panic attacks seems to be the route to depression or fatal accident frankly.
it is limiting, i am a grown woman but in my case i think the sensible option is probably to not drive on motorways for the time being.
incidentally i once had a boyfriend, who used to be quite emotionally abusive, he drove scarily and aggressively to frighten me at times, i sometimes wonder if that's when the seed was sown.