I highly doubt your problems are due to prolactin but mostly is due to your antipsychotic use. While great medications for their indicated uses, metabolic syndrome is a notorious side effect of their use. Atypical antipsychotics are even worse than typical antipsychotics because they also block the 5-HT2c receptor, causing increased appetite, and so forth. Additionally, some antipsychotics, including clozapine, have other mechanisms by which they induce weight gain and metabolic syndrome, as per wiki:

"In addition to hyperglycemia, significant weight gain is frequently experienced by patients treated with clozapine.[37] Impaired glucose metabolism and obesity have been shown to be constituents of the metabolic syndrome and may increase the risk of cardiovascular disease. The data suggest that clozapine may be more likely to cause adverse metabolic effects than some of the other atypical antipsychotics.[38] A study has established that olanzapine and clozapine disturb the metabolism by making the body take preferentially its energy from fat (instead of privileging carbohydrates). Levels of carbohydrates remaining high, the body develops insulin resistance (causing diabetes).[39]

If you need to take an antipsychotic, you should try abilify (aripiprazole) as it tends to be weight neutral due to the fact that it’s a partial 5-HT2c agonist (compared to most antipsychotics that are antagonists at this receptor) although like any medications, there are no guarantees.