Sorry to hear you are having to deal with this right now but I have a few tips that should hopefully help 😃
first we have to consider the severity of the potential impaction. less serious incidences can be addressed more effectively with oral laxatives whether it be osmotic stool softeners (like magnesium citrate) or mineral oil or perhaps glycerin suppositories.
more serious episode of constipation would be more effectively treated with enemas. Then again, a lower volume fleet enema from the drugstore is not as effective as a high volume bag of castille soap enema for example
how long has it been since you had a bowel movement?
another thing to consider is the important role of physical movement and mobility in helping bowel movements. if you have been a little too sedentary maybe go for a walk, do some squats and lunges and that should help move things along. your position when attempting to move your bowels is also important. when you sit on the toilet try to lean forward and go on the tip of your toas to lift your knees higher. This helps relax your puborectalis muscle and lets you go without straining too much.
also keep in mind that hydration is really important, if you are already constipated it is unlikely that drinking more water will solve the issue but important to keep in mind. have you been drinking enough water lately? what color is your urine? ideally it should be very pale under most circumstances(unless if you ate beats or took vitamin B or something)
lastly as another member suggested, gently massaging and stretching the anal sphincter to allow passage of stool can help you prevent straining. doesn't matter if you use a medical anal dilator or a buttplug or had someone perform a digital rectal massage.
depending on how stubborn the constipation is, any of these tips could help you, but ideally you combine these solutions for effective treatment. For example first take an enema, then wear a plug to temporarily dilate your anus slightly as you gently move around and stretch. with that approach you are going to feel the urge to poop in no time 😃
good luck!