hello,,, first of all I would like to inform you that head heaviness is not a specific clue for any disorder. There must be some underlying problem for insomnia. As you have described your mother had history of panic attacks in past, I would like to evaluate details of those attacks, duration of illness at that time, treated or untreated, how was treatment response etc. As panic attack is included in type of anxiety disorder, there is most probably anxiety is linked with insomnia. I would like to know your mother s age, evaluate her mood throughout day, any stressful event ongoing etc. As anxiety is best managed with low dose zolpidem / benzodiazepines / ssri whichever is most appropriate would be finalised only after knowing above details. Thanks and good luck for your mother s health...