A diabetic lancet is not suitable for dermaneedling. A lancet needle is a small knife. Their purpose is to cut the very tough skin of the finger to draw blood for glucose monitoring. And they are shaped to maximise bloodflow, cutting sideways through the skin. This shape is unsuitable for subtle microneedling. Needles for needling have a conic shape with a very long taper and their length does not exceed 2 mm. Dermarollers also have conically shaped needles.
Have you been on Accutane? Most bad outcomes I have heard about happened to those on Accutane.
No, I do not think that applying A-Ret right after rolling contributed to your bad experience. We even have a customer who improved his scars by microneedling and immediate application of A-Ret cream:
https://http://forums.owndoc.com/dermarolling-microneedling/evenly-spread-acne-scars/A 1.5 mm dermastamp is better choice in your case than a dermaroller. Also, in your case, you must do a stamping test on one scar. Stamp one scar only for several months to see what happens. Sometimes thousands of people get good results or at least no problems with certain method and one or two get bad results for unknown reasons.
For example this lady ended up with permanently dilated pores after an IPL treatment:
https://http://www.owndoc.com/img/dilated-pores.jpgTens of thousands of people had an IPL treatment without any effect on their pores but unfortunately not her.
I am sorry but Chloramine T will not be for sale for a while because we have to test it for possible electrolytic effects on our OWNDOC dermarollers. The current batch has titanium-coated stainless steel needles and there is a concern. Later batches will have stainless needles and we will start selling Chloramine-T again when we are certain it will not corrode any later/upcoming type needles.
Where to buy alcohol:
https://http://forums.owndoc.com/dermarolling-microneedling/can39t-find-proper-disinfection-alcohol/