Seeking guidance on avoiding meditation distractions and sluggishness

Do any of you readers , know of a very simple, dependable starting point for an old meditator , who sits everyday, but I do not have contact with any meditation teacher, who I am connected with. I sit, and make an effort to practice the mahasatipattana practice. For example, a thought to start out my meditation, that will enable me to have a session where I am not distracted or get to nervous , or sluggish, and so on. I say some prayers and refuge, and the I meditate, afterwards , I dedicate to merit to all living beings, not excluding a single one. Part of my problem , is as I get older I have more health problems that affect me now, physically.So, I hope I made my question clear. I know , if I could go on a retreat, I would be sitting more firmly, but I can't attend a retreat at this time in my life. I have started , lately, the last two years, sitting for 5 minutes, twice a day. with prayers, dedication of merit and so on. Does any one have a similar situation , were you have figured out how to start correctly? Meaning, starting out and having an undistracted session? The alternative is, I just don't meditate , but maybe read some Buddha sutra, or a good teachers explanation..