Hi Donna,
I suffer with this occasionally. I find if I've carried to heavy a load, that can obviously agravate things. If you're shopping, make sure your bags weight is evenly distributed. Have you ever had an xray? Just wondering about the headaches, could it be a trapped nerve or something? Tens machines are good as are wheat bags that you put in the microwave, they retain heat for about 20 mins. Also anadin extra are very good indeed, the only thing is, not everyone can take them, please read the leaflet inside packaging before buying/ taking. Going back to carrying heavy loads, these days I know my limits, it really does make a difference to be conscious about that! xxx