Welcome to the forum
Much sympathy for the anxious time you are having. No judgements here on the forum - we are all as we are.
From your post I think there are a few aspects for you.
The anxiety
The tingling
lots of thoughts
technical questions to do with Lifeflow.
Let's look at the anxiety first. Anxiety is a big term and it encompasses lots of things. There are the sensations on the body - you have noted the tingling. There is the self-talk - why is it lasting so long? I can't stand it any more - when will it subside? when will it come again? There is a subtle agitation that you can't name, but is very unsettling.
None of this can be happening in the same moment. Have a go and see if you can be aware of more than one thought at a time! So, in each moment there is only one thing you are aware of - it might seem like more - but that is running moments together.
Stereo in your car is fine for listening to Lifeflow - ten to fifteen minute sessions are long enough when there is turmoil. If you are a bit wary of the lifeflow soundtrack, just wait awhile until things are more settled.
Start your meditation session with one deep breath, hold it momentarily and let it out slowly. As you let it out allow the body to relax. Repeat this once. Now let the breathing do as it wants and turn your attention to the body. Become aware of the region around your jaw and allow it to relax. Just below and at the sides of the eyes tension builds when we are thinking - allow that to relax - this is not a forceful relaxation - just allow it to soften. Look for tension in other parts of the body and allow them to relax in the same way. Keep going back to the first two areas, they will keep retightening - you keep softening them.
Thoughts will come, and when we start meditating they come thick and fast. Wanting them not to will increase the flow. Let them be there, but allow them to pass. Like air bubbles floating up from the bottom of a lake, let them just rise up and pass away. As soon as you realise that you have taken hold of a thought and developed it, pop it into a bubble and let it float away.
This rush of thoughts is necessary - it is like a clearing house- as they come up they are leaving clearer space behind them, welcome them and let them go.
After your meditation session its good to drink water and go for a walk.
Try this for a week and let us know how you are doing - we are always happy to help.
Hope this was useful
peace and joy

H