You may want to try a little salt right before bed. Mix it in with some milk for added benefit. Poor retainers of sodium struggle with sleep. (Contrary to popular mainstream belief this will not cause water retention. In fact adding any of the minerals will help with water retention if this is an issue. Drinking more water is not the sole cure.) The tryptophan in the milk will also aid sleep (however it is important not to have too too much tryptophan in the diet that it outweighs the other essential aminos.)
An Epsom salt (magnesium) bath before bed is also helpful and very relaxing. Excellent for restless leg syndrome.
Keep your circadian rhythm in check. Get up and moving, get that daylight as soon as you can in the morning. Maintain a moderate amount of movement throughout the day. Not too sedentary, not overly active (don't over-exercise). Both are detrimental to health and will affect sleep.
If your liver and metabolism are as such that you can not tolerate even a small amount of caffeine without feeling shaky or affecting sleep then it is best to avoid altogether until these issues are rectified.
Have a close look at your diet. Everything you put in your body sets off a chain reaction. Increase your protein - eggs, milk, meat, gelatin. Sugar in the form of fructose or simple cane sugar is not bad (not laddened with polyunsaturated fats ie doughnuts, pastries etc) however I've found if your liver/metabolism can't support it then it can affect sleep too close to bedtime.
I would stay clear of benzos that it is a path you do not want to go down. Although it may help temporarily there is no reboot effect and you may end up much worse than before. This is how people become addicted. Not to mention the changes in your body chemistry it can cause. If you need, try a sedating anti histamine as a temporary measure.
Most importantly lower your stress. Easier said than done with the lives we lead today. But try as hard as you can. Any time you feel stressed you are triggering a chain reaction of the stress hormones, adrenaline, cortisol etc which as we all know do awful things to the body. They can hang around a long while and seriously affect sleep if you don't have enough of the other hormones to supress/outweigh them. You may want to look into L Theanine for its calming effect. (It isn't supposed to make you very drowsy, you don't need to feel such serious physical effects in order to change body chemistry and feel better.) Niacinimide (not to be confused with niacin the flushing version) ie B3 is also very relaxing and beneficial to the body in other ways too.
Agree with avoiding technology and any form of blue light (tv) a couple hours before bed. Getting enough daylight/sunshine and not being in a dark place until near bedtime is important. As the sun is so lacking in the uk (if you live here) you may want to consider testing and taking vitamin d3. This plus increased quality protein will help your progesterone synthesise which is the calming hormone (and will also help with stress) If your estrogen is running rampant this can affect sleep (hence why menopausal ladies suffer with insomnia). Remember the body works synergistically. You can't just change one thing or take one supplement and expect miracles, you need to treat it as a whole and be kind to it.
Any 'Peata' will recognise all this of course.
Good luck op, insomnia can really wreak havoc on your life and health. Hope this is just a temporary blip for you.