I think his family would be the first to help. His sisters could bring him cold compresses to reduce the fever, and his father would use his medical skills. And from the Soul Society, Renji might come to check on him, as he and Ichigo have a sort of friendly rivalry. He would want to make sure Ichigo gets better soon so they can have their next sparring match.
Ichigo would also experience a period of sadness. He values his relationships, and when one is broken through betrayal, it would hurt him deeply. He might isolate himself for a while, brooding over what happened. But ultimately, he would use this experience to become stronger. He'd learn from it and be more cautious in future relationships, while still maintaining his core values of loyalty and trust.
Perhaps in the fanfiction, Sakura gets the Sharingan as a gift from a mysterious figure. This figure might be an ancient ninja spirit or something. With the Sharingan, Sakura's combat abilities would skyrocket. She could start seeing the chakra flow of her opponents more clearly, allowing her to predict their moves better. Also, she could use the Sharingan's genjutsu - related powers to her advantage in battles.
The Sharingan could create some tension within Team 7. Sasuke, who already has a connection to the Sharingan, might feel a bit possessive or protective of this newfound power within the team. Naruto, being Naruto, would probably be excited and want to use it immediately, which could annoy Sasuke. Sakura would be in the middle, trying to keep the peace. But overall, it could also strengthen their bonds as they learn to share and control this powerful ability together.
There could be some very strange and out - of - the - ordinary fanfictions out there that might have such a plot. However, this kind of plot goes against the normal character relationships and storylines in the original Bleach series. Usually, fanfictions tend to focus on more traditional themes like battles, friendships, and power - ups rather than such extreme and uncharacteristic situations.
One possible plot twist could be that Ichigo struggles to control the Sharingan at first. Since he's not from the Naruto universe originally, the sudden addition of the Sharingan's powers might be overwhelming. He might accidentally activate it during battles in the Bleach world and it could give him an edge in seeing his opponents' moves more clearly, but also make him a target as it's an unknown power in his world.
It could be Orochimaru. Since he has always been interested in powerful ninja abilities, he might see Sakura with the Sharingan as a new target. He could try to steal the Sharingan from her to add to his own collection of powerful jutsus and abilities.
Well, in the fanfiction, Team 7 might face new and more powerful enemies. With the Sharingan, they could gain enhanced combat abilities. For example, Naruto could use the Sharingan's predictive abilities to better dodge attacks and plan his own offensive moves. Sasuke, already having the Sharingan, might unlock new forms or powers related to it. Sakura could also benefit in terms of her medical ninjutsu, perhaps using the Sharingan to better analyze and treat complex injuries. This would change the dynamics of the team and lead to more exciting adventures.