Just wanted to say how happy I was to hear your work are paying for you...what a relief that is!
I had a transforaminal injection (under CTscan) for left-sided foraminal stenosis at L5/S1. First was on Feb 5th. Next one is March 12 (apparently 4-6wks between them is standard, at least over here).
Here's the story:
Injection: I had gas (and was glad for it!) Needle in. Just a bit uncomfortable. Numbing agent/dye in. (I think). Very painful!!!!! All the way to the toes, tingling, stomach ache.. for a few minutes. I thought they'd hit the nerve, but apparently it was just the liquid hitting the nerve and filling what little space is there for the nerve. But once they'd found the spot, or the numbing had taken effect or whatever, it was fine, just a bit uncomfortable. I was shaky shaky after (gas or the shock, I don't know) but fine after about 20mins. Stiff sore back, leg numbness a bit. After about an hour, it came back much worse (like the stenosis pains but agony straight away in any position)and this lasted for a couple of hours. Could only lie on my belly (which isn't normally good for me, but was the same position as the injection).
Then it was pretty bad (but not as bad as after injection) for around 4-5 days, then things settled down to as previously, (stenosis pains still there on standing/sitting/walking) but without some of the sciatic pains I normally had in the evening and with a milder sharp specific stabbing pain I used to get on the left-centre side in my back.
Went back to work after 2weeks (normally I couldn't sit in a desk chair) and was tough for two days, then okay for two days. But friday was like before the injection (couldn't sit for very long at all) and since saturday the stenosis has been slightly worse than before. All the sciatic pains also came back that week, but the sharp pain remains disappeared.
So. In brief.
Injection. Very painful during and for a few hours after.
4-5 days of muscle soreness and back pain that I didn't have previously
then 1 week as pre-injection, but no/little sciatica.
Then 1 week (til today) of worse stenosis and sciatica is back a little (but then its never been that bad for me).
Hope I haven't put you off. The sooner you get the injection, the sooner you'll know how you get on with it. Many people have very positve experiences!!! and I'm still hoping the second has a better, longer lasting effect!
Good luck, let us know how you get on. When's your appointment?