Based on the description the signs & symptoms more closely resemble the "KIDNEY STONE"
*(1) No this is not a liver pain
**(2) your are correct its not the asthma related pain.
Kidney stone passing though the ureter (tube that connects the kidney to bladder here urine is collected) may cause pain. In such condition drinking good amount of water will help to flush the stone and decrease the pain but it may take some time , mean while over the counter pain killer can used to relive the pain if can't be tolerated.
CONSULT - urologist
/ any physician.
Here is what they tend to do in most of the case.
1) Will do physical examination
2) do ULTRASOUND
3) will do some blood test
and urine test
4) May require other procedure like CT scan
5) TREATMENT : mostly drink lot of water and try to wait till the stone passes, and the strong pain killer to get relief mostly over the counter medication
will not help much in such a strong pain as you describe, and from such medication you need the prescription.
Hope it helps.