GD late in pregnancy?

Roxanne • Pregnant with baby 5, due June :)
I'm currently 36 weeks pregnant. I've previously had GD in 3 other pregnancies, been tested twice this one and results have been fine but the last few days I really haven't felt to great after I eat I feel shakey well just awful! If I leave bigger gaps inbetween eating (to avoid the yuck feeling after food) I again feel really poorly. Ive had a dull head ache for 2 days. I've not for an appointment till I'm 38weeks, my GP is fully booked. Getting hold of my midwife is proving very difficult but the hospital does have a triage that they assess pregnant ladies. I'm worried I'm over reacting, especially as I can't actually explain what's wrong properly. I just don't feel very well at all :( worth going or just suck it up?