According to Cathcart this should almost be expected when you expect when you depart from standard practice (the use of parentovit and a saline base both are likely to blame for the bad reaction). Also the yellow-ish color is also a departure from Cathcart's recommendation. If it's yellow it's probably oxidized and you're not getting the bioavalable electrons or antioxidizing effect that reduced vit C provides.
Here's Cathcart's video on IVC preparation:
https://www.youtube.com/watch?v=iuRTLoQlSksIt should be the gold standard for how to do IVC. Please view this if you have not yet. It should be your IVC bible.
Dr. Cathcart's recommended that his solution be as non-yellow as possible, noting of course that sodium ascorbate (neutral solution) does take a slightly pale-yellow hue, but not "yellow". In my own preparations of fresh full strength sodium ascorbate (from powder, used both nowFoods and SwansonVitamins brands) to the point of precipitate then worst case the color is more like nearly colorless white grape juice. When it gets yellow-ish I throw it out. This is why Cathcart prepared his with the precipitate in the bottom, mixing it to dissolve just prior to use because it stayed colorless that way.
Note that Owen's use (see above post) can be confusing for those unfamiliar with his condition or terminology, or who are not using it the same way to specifically target things such as heavy metal poisoning as he has been doing. Those methods should probably only be attempted after a patient has experienced Cathcart's original protocol (see link above) with no negative effects, I think this is what Owen calls a "flush". Also, with regard to "commercial preparations" ... there are many different commercial preparations ... some worse that others (some reportedly almost orange which is probably mostly oxidation, ie. dehydroscorbic acid, in which case it will not donate any valuable bio-available electrons).