I wonder if it's unreasonable to ask if a flatus tube might be used on oneself. Decades ago when I was a nurse the procedure was very simple and easy and often was effective. I expect these thin rubber tubes can be bought online. I know that some people cannot bear to introduce anything into their body cavities, but for a former nurse it's little more difficult than swallowing a pill.
Anyway, you generously lubricate the tube at the end with the little hole in it. You lie on your left side and put it into your anus about three inches, directing it towards the front, as that is the way the rectum slopes( rather like inserting a tampax angled slightly towards the front). We used to put the other end of the tube in a basin of water so we could check for the bubbles, but it's not necessary.
Now that there aren't enough district nurses, or even enough private nurses to hire by the hour from an agency, we should be taught how to care for ourselves when possible.