No way to fix the relic problem until you finish the story, its just part of how things go. Main story paths each handle it differently and youll need to pick your ending carefully. Most give you about 6 months after everything's done, but theres some variety like working with arasaka in their soul program or taking the phantom liberty route which fixes things but puts you in a coma and kills your cyber gear. The aldecaldos path might have a cure down the line, but nothing's guaranteed. Good to know the glitches and health problems you see during gameplay are meant to be there, so dont waste time looking for mid-game fixes just focus on pushing through the story when youre ready.

Playing through normally until you hit the point of no return is your best bet, then you can weigh your options for dealing with the whole relic situation. Tip worth remembering all those annoying visual problems and health issues are totally normal story stuff so no need to reload old saves trying to avoid them.