Marianne,
My two cents: yes, it is well worth your time to practice as much as you can. I would even try to do a bit more, if you have time. This sounds a bit like a healing reaction. I had a kind of panic/anxiety reaction during a bout of intensive SFQ practice about a month ago. I felt it was a sign of energy blockages being released and by "working through it", it got much better.
If you have so much trouble focusing, try and distract yourself, with something else for a few minutes and then come back to the practice. It is a bit like weeding: sometimes you have to "play" with the roots of the weed to get it out of the ground" pull a little, dig a little, pull a little more, dig from another direction etc.
Sometimes when something is interfering with my ability to focus, instead of trying to "fight it", I more or less,"play" with it. For example, I might do a bit of the active exercise, maybe only one or two exercises for 15 mnutes or so. Then, I might play the guided meditation, "self concentration" (or the Butterfly meditation, which I like even better). That might turn into a nap, which is fine. Then I might try to do a little more active, and then a few minutes of Small Universe.
It is a bit like "pushing hands" in Tai Chi-- it is not direct confrontation, but more a give and take with the blockage.
So, you might do a combination of what you are asking: both put aside AND keep going. In other words, put it aside just for a few minutes, watch a little TV or something else to distract yourself: music, a puzzle, read an entertaining story or a book and then come back to the practice for a few minutes and see if you can do a little more this time. Then distract yourself again.
Hope this helps.
